## _wp15167 — 1990. Relative to classical studies of pre-WWII spreads by Bordo and Rockoff (1997),

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---

### Contributions and scope
- Adds more countries, fixes data issues, and comprises more control variables, including global market factors highlighted in recent work.
- Extends many series on sovereign spreads back to the 1970s and 1980s and adds advanced countries to allow coverage of major recent events in sovereign debt markets.
- Combines an expanded historical sample and extended post-WWII series (with advanced countries) to document empirical default premia (DPs) by decomposing the spread into:
  - a vector of observable fundamentals,
  - the DP,
  - surpluses from borrowers in certain circumstances,
  - an estimation error,
  - distinct functional forms for memory formation,
  - re-evaluation of the importance of the actual size of the default (the final “haircut”) in shaping DP evolution.
- Focus is on competitive bond markets where collusion is arguably more limited.

### Main empirical results (summary)
- Impact DP estimates:
  - around 250 basis points in the period 1870-1938,
  - 400 bps in 1970-2011.
- Decay profile of the DP:
  - by the end of the 5th year after debt settlement it averages some 150 basis points in the pre-WWII period and 200 bps post-1970, tapering off thereafter.
- Statistical properties and variance:
  - the DP is significant at conventional statistical levels but displays considerable variance; limited sampling can greatly affect inference on the mean DP.
- Contribution of observables vs. DP:
  - changes in observable fundamentals account for less than half of variations in market spreads between pre-default and post-settlement spells; the DP contribution is key.
- DP and serial defaulting:
  - the DP rises with the number of years a sovereign stays out of the market; serial defaulters pay a higher DP.
- Robustness to memory specifications:
  - the DP is no smaller for alternative specifications on how investors’ memories evolve.
- Role of actual haircut:
  - direct control for the size of the actual haircut in spread regressions is not necessary to obtain a significant and longer lasting DP.
  - close to 90% of the actual haircut can be predicted by the length of the default and country-specific fundamentals; the informational content from the haircut “shock” to DP evolution appears to be very small.

### Theory (model setup and implications)
- Market and agents:
  - competitive market populated by risk-neutral lenders who break-even given their beliefs;
  - lenders have access to a risk-free technology with gross rate Rf,t = 1 + rf,t taken as exogenous.
- Default technology and costs:
  - in case of default at t+1, creditors expect to recover a fraction E(c_{t+1}) of contractual repayment obligations D_t with 0≤E(c_{t+1})<1;
  - expected haircut E(h_{t+1}) = 1 − E(c_{t+1});
  - default entails a fraction κ of the sovereign’s current output ˜Y_t being lost, where 0<κ<1 (deadweight loss).
- Break-even condition and spread:
  - lenders hold bonds if: [π_t E(c_{t+1}) + (1−π_t)] R_t = R_{f,t}.
  - defining spread s_t = R_t / R_{f,t} − 1 yields s_t = π_t E(h_{t+1}) / [1 − π_t E(h_{t+1})].
- Sovereign repayment decision (linear utility, one-period bond):
  - repayment if Y_t − D_t + β_t V^r_{t+1}(.,ϵ_t) ≥ (1−κ) Y_t − E(c_{t+1}) D_t + β_t V^d_{t+1}(.,ϵ_t).
  - rearranged: β_t [V^r_{t+1}(.,ϵ_t) − V^d_{t+1}(.,ϵ_t)] ≥ E(h_{t+1}) D_t − κ Y_t.
- Role of information asymmetry and signaling:
  - if lenders do not observe persistent component ϵ_t but sovereign does, sovereign actions (repay/default) are informative about D/Y and future default risk;
  - repayment signals bright growth outlook, raising V^r and lowering R; adverse persistent shocks raise default likelihood and R.
- General implications:
  - borrower’s past actions are informative about future default risk;
  - existence of a threshold ϵ^*_t below which default occurs;
  - a positive premium R^d − R^r > 0 which is a function of credit history;
  - probability of default and expected haircut are jointly determined; expected haircut may differ from final actual haircut due to ex-post bargaining.

### Empirical specification of DP
- Spread decomposition:
  - s_{i,t} = α_i + F_{i,t} β + DP_{i,t}, where s_{i,t} is country i spread at time t; F_{i,t} is row vector of common-knowledge observable fundamentals; DP_{i,t} is default premium.
- DP functional form:
  - DP_{i,t} = γ_1 MEM1_{i,t} + γ_2 MEM2_{i,t} + Σ_{j=1}^m δ_j DS(j)_{i,t}.
- Definitions:
  - MEM1_{i,t}: ratio of the number of years country i is in default to the total number of years in the sample up to year t (proxy for credit history).
  - MEM2_{i,t}: number of years since the last default.
  - DS(j)_{i,t}: dummy equal to one if t is the jth year after settlement on the defaulted debt; there are m such dummies (0<j≤m).
- Expected signs:
  - γ_1 > 0, γ_2 expected to be negative.
- Role of DS dummies:
  - capture discrete post-settlement discontinuities; empirical choice m = 5 (post-default dummies beyond a 5-year window are no longer statistically or economically significant).
  - restricting credit history to settlement dummies reduces DP size by between 60 to 100 basis points and its persistence.
- Full panel specification:
  - s_{i,t} = α_i + F_{i,t} β + γ_1 MEM1_{i,t} + γ_2 MEM2_{i,t} + Σ_{j=1}^m δ_j DS(j)_{i,j} + ε_{i,t}.
- Important caveat:
  - ∆DP_{i,t,T} = ∆s_{i,t,T} − ∆F_{i,t,T} β: changes in market spread equal changes in DP only if observable fundamentals do not move between pre-default and market re-entry.
  - DP can be positive even if spread at settlement is lower than before default; conversely spread can be higher while DP is zero.

### Dataset and measurement
- Default definition and dating:
  - Uses Standard and Poor’s (S&P) definition of default (unilateral interruption of repayment and/or exchange offer accepted by lenders).
  - Uses S&P dating of the end of defaults (settlement when S&P concludes no further near-term resolution likely).
- Treatment of rescheduling:
  - Rescheduling episodes that are ramifications of the initial default are not counted as new defaults.
  - Example: Brazil defaulted in 1983 with renegotiations in 1984, 1986, 1988 and a full renegotiation in 1992; treated as default year 1983 and market re-entry 1993.
- Inclusion of averted defaults:
  - Adds credit events where country borrowed from IMF more than 200% percent of quota.
  - This adds events including Argentine and Mexico debt crises of 1995, Asian and Russian crises of 1997-98, European debt crises of 2008-2011.
- New sovereign spreads database:
  - Extends post-WWII data backward to 1970 for both advanced and emerging markets by combining yield data from primary bond issuance and secondary market trading.
  - Controls for potential differential effects in spreads from primary vs. secondary yields.
  - End-product: annual database on sovereign spreads totaling more than 2,900 observations:
    - 1,639 in 1870-38,
    - 1,294 in 1970-2011.
  - Comparison to other datasets (annual-equivalent observations cited): Ozler (131-144), Flandreau and Zumer (215-265), Borenzstein and Pannizza (144-162), Benczur and Ilut (169), Cruces and Trebesch (310-447).
- Dependent variable measurement:
  - Country spreads generally measured as difference between country sovereign bond yields (in pounds sterling before WWII or US dollars after WWII) and the UK consol or the US 10-year government bond yield, respectively.
  - For some 1970-2011 observations, spread measured vs relevant benchmark yield curve at similar maturity.

### Econometric controls and sample construction (Section 5.1)
- Sample split:
  - pre-WWII: 1870-1938;
  - post-WWII: early 1970s–2011.
- Variables included in F_{i,t} (all lagged one year; robust standard errors clustered at country level):
  - public debt to GDP ratio;
  - real world (risk-free) interest rate;
  - trend-like measure of real GDP growth (3-year moving average);
  - indicators of output cost of default: trade openness, foreign exchange reserves (ratio to imports or GDP), fixed exchange rate dummy;
  - global risk-aversion indicator (stock price volatility indices for UK and US);
  - share of external debt in total debt.
- Additional robustness controls tested:
  - ratio of M2/GDP;
  - log-level and rolling standard deviations of external terms of trade from its 3-year past moving average;
  - general government fiscal balance to GDP;
  - sovereign dummy for newly independent countries in the post-WWII period.
- Pre-1939 regressions include a World War I dummy equal to 1 in 1914-18.
- Years where debt was in arrears are eliminated from the sample to mitigate endogeneity biases.
- Model uncertainty addressed via model averaging following Pesaran and Timmermann (2007).

### Regression highlights (1870-1939 and 1970-2011)
- 1870-1939:
  - public debt/GDP ratio, ratio of external to total debt, gold-peg dummy generally significant with expected signs.
  - world real interest rate and/or composite stock market volatility are important.
  - foreign exchange reserves and 3-year moving average of real GDP growth have expected negative sign; trade balance yields opposite sign; none significant.
  - MEM1 sizeable and statistically significant.
  - MEM2 has a negative coefficient of 0.01 (investors’ memories fade at 1 basis point per year); MEM2 significance reduced when time effects included.
  - debt settlement dummies yield sizeable and significant coefficients through the second or third year after settlement.
- 1970-2011:
  - trade balance, global stock market volatility, reserves show up as highly significant.
  - post-settlement impact dummies significant through only the first or second year after default but with sizeable coefficients higher than pre-WWII.
  - MEM variables are highly significant and sizeable; removing MEM variables makes post-settlement dummies significant at 5% through the fifth year after market re-entry.
  - summing fitted values for DS(1), MEM1 and MEM2: default premium on impact is about 150 bps higher than pre-WWII.
- Robustness:
  - TOT volatility, fiscal balances, and polity index not significant in many specifications.
  - alternative default definition including large IMF support ((IMF)) makes debt/GDP lose significance, but default premium variables remain broadly significant.

### Controlling for actual haircuts
- Theoretical point: expected haircut matters for forward-looking bond pricing; past haircuts matter only as information about expected future haircuts.
- Empirical tests:
  - interacting actual haircuts with DS dummies roughly halves observations; F-test on joint significance of interactive (DS*HC) dummies yields p-value = 33 percent; original DS dummies remain significant at 5 percent.
  - including actual haircuts renders memory variables insignificant (possible multicollinearity).
  - regressions with actual haircuts as dependent variable (sample of 42 debt settlement episodes): explanatory variables explain as much as R-square = 0.88 (full sample) and R-square = 0.91 (emerging markets sample).
  - actual haircut highly predictable by length of default (captured by MEM2) and size of debt.
- Interpretation:
  - expected haircut (= 1 − E(c)) is highly predictable by other controls; adding cross-country dispersion of actual haircuts yields little additional explanatory power.
  - authors remain agnostic about value added of unexpected component of past haircuts due to data limitations.

### Memory alternatives
- Additional memory indicator mem4r (number of defaults per country) tested:
  - captures whether more frequent defaults (holding average duration constant) lead to higher spreads.
  - result: difference is insignificant; if anything, fewer but longer defaults tend to trigger higher default premia.
- Alternative functional forms for MEM2 tested:
  - quasi-hyperbolic, hyperbolic, exponential, inverse (geometric) discounting.
  - MEM1 remains significant across alternatives; MEM2 results vary in sign consistent with functional form but regression fits are no better than linear baseline.
  - evidence supports sticking to linear MEM2; default premium is higher rather than lower under alternatives.

### Default premium (DP) estimates and contrasts (Section 5)
- DP defined as in equation (5); cross-country mean DP summarized for pre- and post-WWII sub-samples using favored specification (no time effects; removing most statistically insignificant variables).
- Key DP findings:
  - sizeable DP in first few years after market re-entry; DP does not die out thereafter although it becomes very small for the bottom quartile.
  - model-uncertainty robustness: median DP computed across eight alternative specifications yields positive and sizeable DP with corroborating error bands.
- Comparison between DP and raw sovereign spreads:
  - median DP and median sovereign spread differ non-trivially.
  - failing to net out publicly-observable fundamentals leads to mismeasurement:
    - underestimation of DP at market re-entry by as much as 150 bps in pre-WWII era;
    - overestimation by over 50 bps in post-1970 era.
  - incorrect inference example: assuming DP decayed more rapidly post-WWII would be misleading (300 bps vs. 150 bps between first and third year after settlement).
- Qualitative point:
  - DP can jump, consistent with asymmetric information and default as a discrete signal; spread changes decomposed into changes in publicly-observed fundamentals vs. changes in DP.

### Fundamentals vs. Default Premium (Section 5.4)
- Decomposition of sovereign spreads:
  - combining estimated parameters with equation (7) measures contribution of publicly-observable fundamentals (Fβ) vs. DP and estimated error term.
- Contributions within five years after debt settlement:
  - Pre-WWII (1870-1938): default premium accounts for between 35 to 50% of the spread within five years after debt settlement.
  - Post-1970: default premium contribution is even higher on impact, reaching up to 60%.
- Serial defaulters vs. non-serial defaulters:
  - Both the spread and the DP are larger for serial defaulters.
  - Estimation error is low in both cases.
  - Serial defaulters face costlier borrowing for the same set of fundamentals compared to non-serial defaulters.
  - No significant difference in DPs between countries that defaulted more often but for shorter periods vs. those that defaulted less often but for longer periods: what matters is total number of years in default and recency of last default.
- Economic significance (example):
  - For the average post-1970 defaulter (mean public debt/GDP ratio of 50 percent and which never defaulted before):
    - Point estimates of the DP imply an extra interest cost of 2 percent of GDP upon market re-entry, tapering to 1 percent of GDP five years hence.
  - A serial defaulter with otherwise similar characteristics would face an even higher interest bill.
- Drivers of larger and more persistent DP estimates:
  - broader DP metric (non-linear effects of post-settlement dummies and slowly-decaying memory variables);
  - a much broader cross-country panel (longer time-series and wider cross-section);
  - wider variety of controls and averaging across alternative specifications.

### Policy-relevant implications
- The positive, sizeable, and persistent default premium that rises on market exclusion spells helps rationalize:
  - why governments typically try hard not to default;
  - why, when they default, they seek early renegotiation.
- Quantitatively relevant magnitudes:
  - Default premium accounts for between 35 to 50% of the spread within five years after debt settlement in 1870-1938.
  - Default premium contribution reaches up to 60% on impact in the post-1970 period.
  - For an average post-1970 defaulter with mean public debt/GDP ratio of 50 percent and no prior defaults: extra interest cost of 2 percent of GDP on market re-entry, tapering to 1 percent of GDP five years later.

*Source: _wp15167 - 1990.  Relative to classical studies of pre-WWII spreads by Bordo and Rockoff (1997),*

### 1990.  Relative to classical studies of pre-WWII spreads by Bordo and Rockoff (1997),

### _wp15167 - 1990.  Relative to classical studies of pre-WWII spreads by Bordo and Rockoff (1997),

### Contributions and scope
- Adds more countries, fixes issues with the data and comprises more control variables, including for global market factors highlighted in recent work (Borri and Verdelhan, 2011; and Longstaff et al., 2011).
- Extends many series on sovereign spreads back to the 1970s and 1980s and adds advanced countries to the sample, allowing coverage of major recent events in sovereign debt markets.
- Combines two contributions (expanded historical sample and extended post-WWII series with advanced countries) to yield a third: documents salient features of empirical default premia (DPs) by decomposing the spread into:
  - a vector of observable fundamentals,
  - the DP,
  - surpluses from borrowers in certain circumstances (e.g., relationship banking and syndicated loans),
  - an estimation error,
  - distinct functional forms for memory formation,
  - re-evaluation of the importance of the actual size of the default (the final “haircut”) in shaping DP evolution.
- Focus is on competitive bond markets, where scope for collusion is arguably more limited.

### Main empirical results (summary)
- Impact DP estimates:
  - around 250 basis points in the period 1870-1938,
  - 400 bps in 1970-2011.
- Decay profile of the DP:
  - by the end of the 5th year after debt settlement it averages some 150 basis points in the pre-WWII period and 200 bps post-1970, tapering off thereafter.
- Statistical properties and variance:
  - the DP is significant at conventional statistical levels but displays considerable variance; limited sampling can greatly affect inference on the mean DP.
- Contribution of observables vs. DP:
  - changes in observable fundamentals account for less than half of variations in market spreads between pre-default and post-settlement spells, implying the DP contribution is key.
- DP and serial defaulting:
  - the DP rises with the number of years a sovereign stays out of the market; this being higher for serial defaulters implies they pay a higher DP.
- Robustness to memory specifications:
  - the DP is no smaller for alternative specifications on how investors’ memories evolve.
- Role of actual haircut:
  - unlike Cruces and Trebesch (2013), direct control for the size of the actual haircut in spread regressions is not necessary to obtain a significant and longer lasting DP.
  - close to 90% of the actual haircut can be predicted by the length of the default and country-specific fundamentals; thus the informational content from the haircut “shock” to the evolution of the DP appears to be very small.

### Theory (model setup and implications)
- Market and agents:
  - competitive market populated by risk-neutral lenders who break-even given their beliefs,
  - lenders have access to a risk-free technology with gross rate Rf,t = 1 + rf,t taken as exogenous.
- Default technology:
  - in case of default at t+1, creditors expect to recover a fraction E(c_{t+1}) of contractual repayment obligations D_t with 0≤E(c_{t+1})<1,
  - expected haircut E(h_{t+1}) = 1 − E(c_{t+1}),
  - default entails a fraction κ of the sovereign’s current output ˜Y_t being lost, where 0<κ<1, and deadweight loss is assumed.
- Break-even condition and spread:
  - lenders hold bonds if: [π_t E(c_{t+1}) + (1−π_t)] R_t = R_{f,t}.
  - defining spread s_t = R_t / R_{f,t} − 1 yields s_t = π_t E(h_{t+1}) / [1 − π_t E(h_{t+1})].
- Sovereign repayment decision (linear utility, one-period bond):
  - repayment if Y_t − D_t + β_t V^r_{t+1}(.,ϵ_t) ≥ (1−κ) Y_t − E(c_{t+1}) D_t + β_t V^d_{t+1}(.,ϵ_t).
  - rearranged: β_t [V^r_{t+1}(.,ϵ_t) − V^d_{t+1}(.,ϵ_t)] ≥ E(h_{t+1}) D_t − κ Y_t.
- Role of information asymmetry:
  - if lenders do not observe persistent component ϵ_t but sovereign does, sovereign actions (repay/default) are informative about D/Y and future default risk;
  - signaling: repayment signals bright growth outlook, raising V^r and lowering R; adverse persistent shocks raise default likelihood and R.
- General implications:
  - information asymmetries make borrower’s past actions informative about future default risk;
  - existence of a threshold ϵ^*_t such that realizations below trigger default;
  - a positive premium R^d − R^r > 0 which is a function of credit history;
  - probability of default and expected haircut are jointly determined; expected haircut may differ from final actual haircut due to ex-post bargaining.

### Empirical specification of DP
- Spread decomposition:
  - s_{i,t} = α_i + F_{i,t} β + DP_{i,t},
  - where s_{i,t} is country i spread at time t, F_{i,t} is row vector of common-knowledge observable fundamentals, DP_{i,t} is default premium.
- DP functional form:
  - DP_{i,t} = γ_1 MEM1_{i,t} + γ_2 MEM2_{i,t} + Σ_{j=1}^m δ_j DS(j)_{i,t}.
- Definitions:
  - MEM1_{i,t}: ratio of the number of years country i is in default to the total number of years in the sample up to year t (proxy for credit history; Reinhart et al. (2003) used similar).
  - MEM2_{i,t}: number of years since the last default (Eichengreen and Portes (1986); Reinhart et al. (2003); Flandreau and Zummer (2004); Esteves (2007)).
  - DS(j)_{i,t}: dummy equal to one if t is the jth year after settlement on the defaulted debt (the year the country fully re-enters the international debt market after its last default); zeros otherwise; there are m such dummies (0<j≤m).
- Expected signs:
  - γ_1 > 0, γ_2 expected to be negative (longer time since last default lowers DP).
- Interpretation of MEM variables:
  - MEM1 summarizes unobserved nature of size and persistence of shocks that trigger defaults; MEM2 complements with timing and duration information.
  - MEM1 and MEM2 may also proxy for unobserved parameters like β (country “type”).
- Role of DS dummies:
  - capture discrete post-settlement discontinuities; empirical choice m = 5 (post-default dummies beyond a 5-year window are no longer statistically or economically significant).
  - combining MEM1, MEM2 and DS(j) nests previous specifications (Reinhart et al., Eichengreen and Portes, Flandreau and Zummer, Borenzstein and Panizza, Cruces and Trebesch).
  - restricting credit history to settlement dummies reduces DP size by between 60 to 100 basis points and its persistence.
- Full panel specification:
  - s_{i,t} = α_i + F_{i,t} β + γ_1 MEM1_{i,t} + γ_2 MEM2_{i,t} + Σ_{j=1}^m δ_j DS(j)_{i,j} + ε_{i,t}.
- Important caveat:
  - DP does not necessarily move one-to-one with unconditional market spreads s_{i,t}.
  - ∆DP_{i,t,T} = ∆s_{i,t,T} − ∆F_{i,t,T} β: changes in market spread equal changes in DP only if observable fundamentals do not move between pre-default and market re-entry.
  - DP can be positive even if spread at settlement is lower than before default; conversely spread can be higher while DP is zero. Pre-post spread differences can mislead on true interest cost of default.

### Dataset and measurement
- Default definition and dating:
  - Uses Standard and Poor’s (S&P) definition of default (unilateral interruption of repayment and/or exchange offer accepted by lenders).
  - Uses S&P dating of the end of defaults (settlement when S&P concludes no further near-term resolution likely).
  - Appendix Table A1 lists default and settlement dates (not reproduced here).
- Treatment of rescheduling:
  - Treat sovereign defaults as watershed-like occurrences; re-scheduling episodes that are ramifications of the initial default are not counted as new defaults.
  - Example: Brazil defaulted in 1983 with renegotiations in 1984, 1986, 1988 and a full renegotiation in 1992; treated as default year 1983 and market re-entry 1993 (rather than multiple defaults).
- Inclusion of averted defaults:
  - Expanded definition of credit events incorporates seemingly averted defaults due to last resort multilateral financing; adds credit events where country borrowed from IMF more than 200% percent of quota (as in Catão and Milesi-Ferretti (2014)).
  - This adds events including Argentine and Mexico debt crises of 1995, Asian and Russian crises of 1997-98, European debt crises of 2008-2011.
- New sovereign spreads database:
  - Draws on variety of new sources to add more countries and correct inconsistencies.
  - Extends post-WWII data backward to 1970 for both advanced and emerging markets by combining yield data from primary bond issuance and secondary market trading.
  - Controls for potential differential effects in spreads from primary vs. secondary yields.
  - Improves on gaps in key fundamentals (ratio of external to total debt, monetary data) relative to Reinhart and Rogoff (2009).
  - End-product: annual database on sovereign spreads totaling more than 2,900 observations:
    - 1,639 in 1870-38,
    - 1,294 in 1970-2011.
  - Comparison to other datasets:
    - Ozler (1993, Table 1): 131-144 observations,
    - Flandreau and Zumer (2004, Table A.7): 215-265,
    - Borenzstein and Pannizza (2009, Table 5): 144-162,
    - Benczur and Ilut (2015): 169,
    - Cruces and Trebesch (2013): 310-447 annual-equivalent observations.
- Dependent variable measurement:
  - Country spreads generally measured as difference between country sovereign bond yields (in pounds sterling before WWII or US dollars after WWII) and the UK consol or the US 10-year government bond yield, respectively.
  - For a few 1970-2011 observations where maturity and currency of issuance were known, spread measured vs relevant benchmark yield curve at similar maturity.

### Structure of remainder of paper
- Section 2: presents the theory underpinning the empirical DP metric.
- Section 3: specifies the empirical DP metric.
- Section 4: introduces the new dataset.
- Section 5: reports DP estimates, robustness tests, and spread decomposition exercises.
- Section 6: concludes.
- Appendix: specifics of the data.

*Source: _wp15167 - 1990.  Relative to classical studies of pre-WWII spreads by Bordo and Rockoff (1997),*

### 5.1    Econometric Controls

### _wp15167 - 5.1    Econometric Controls

### Econometric controls and sample construction
- Sample broken into pre-WWII (comprising 1870-1938) and post-WWII sub-sample (starts in the early 1970s and ends in 2011).
- Variables included in Fi,t (all lagged one year; robust standard errors clustered at country level):
  - public debt to GDP ratio;
  - real world (risk-free) interest rate;
  - trend-like measure of real GDP growth (computed as a 3-year moving average);
  - indicators of output cost of default: trade openness, foreign exchange reserves (as a ratio to imports or GDP), fixed exchange rate dummy;
  - global risk-aversion indicator (proxied by indices of stock price volatility in the UK and the US);
  - share of external debt in total debt.
- Additional robustness controls tested:
  - ratio of M2/GDP;
  - log-level and rolling standard deviations of external terms of trade from its 3-year past moving average;
  - general government fiscal balance to GDP;
  - sovereign dummy for newly independent countries in the post-WWII period.
- Pre-1939 regressions include a World War I dummy equal to 1 in 1914-18 and zero otherwise.
- Years where debt was in arrears (limited or non-existent market access) are eliminated from the sample to mitigate endogeneity biases.
- Model uncertainty addressed via model averaging following Pesaran and Timmermann (2007).

### Regression results (1870-1939 and 1970-2011)
- 1870-1939 (Table 1):
  - country fixed effects and time fixed effects specifications reported.
  - key fundamentals: overall public debt/GDP ratio, ratio of external to total debt, gold-peg dummy yield expected signs and are statistically significant for the most part.
  - world real interest rate and/or composite stock market volatility (UK and US) are important.
  - foreign exchange reserves and 3-year moving average of real GDP growth have expected negative sign; trade balance yields opposite sign; none significant.
  - public debt to GDP ratio significant in all specifications.
  - debt settlement dummies (from year of market re-entry through 5 years hence) yield sizeable and significant coefficients through the second or third year after settlement in all four specifications.
  - memory variables:
    - MEM1 (years out of market as share of total years up to that point) is sizeable and statistically significant;
    - MEM2 has a negative coefficient of 0.01, indicating investors’ memories fade away at a rate of 1 basis point per year; MEM2 significance is reduced when time effects are included (multicollinearity).
- Robustness checks (Table 2):
  - terms of trade gap (past three-year moving average), M2/Y, government balance/GDP, and seasoned borrower dummy are not statistically significant.
  - rolling 10-year standard deviation of terms of trade not significant.
- 1970-2011 (Table 3):
  - many determinants (trade balance, global stock market volatility, reserves) show up as highly significant.
  - include dummy for primary market data for pre-1990 observations.
  - post-settlement impact dummies statistically significant through only the first or second year after default but with sizeable coefficients higher than pre-WWII.
  - MEM variables are highly significant and sizeable; removing MEM variables makes post-settlement dummies significant at 5% through the fifth year after market re-entry.
  - summing fitted values for DS(1), MEM1 and MEM2: default premium on impact is about 150 bps higher than pre-WWII (see Figure 1).
- Additional robustness (Table 4):
  - TOT volatility, fiscal balances, and polity index not significant.
  - alternative definition of default events to include large IMF support programs (labeled (IMF)) makes debt/GDP lose significance, but default premium variables remain broadly significant.

### Controlling for actual haircuts
- Theoretic and practical discussion:
  - expected haircut (future haircut) is what matters for forward-looking bond pricing; past haircuts relevant only to the extent they inform expected future haircuts.
  - estimated coefficients on some regressors (including DS dummies) already capture panel average haircut.
- Empirical tests (Table 4 and Table 5):
  - interacting actual haircuts with DS dummies roughly halves the number of observations; F-test on joint significance of interactive (DS*HC) dummies yields probability value of 33 percent; original DS dummies remain significant at 5 percent.
  - including actual haircuts renders memory variables insignificant (possible multicollinearity with haircut size and inclusion of time fixed effects).
  - regressions with actual haircuts as dependent variable (Table 5):
    - sample of 42 debt settlement episodes: explanatory variables in baseline specification explain as much as 88 percent of actual haircuts (R-square = 0.88).
    - sample limited to emerging markets: R-square = 0.91.
    - actual haircut highly predictable by length of default (captured by MEM2) and size of debt.
- Interpretation:
  - expected haircut (= 1 − E(c)) is highly predictable by other controls, so adding cross-country dispersion of actual haircuts yields little additional explanatory power.
  - authors remain agnostic about the value added of the unexpected component of past haircuts due to data limitations.

### Memory alternatives
- Additional memory indicator mem4r (number of defaults per country) tested:
  - captures whether more frequent defaults (holding average duration constant) lead to higher spreads.
  - result indicates difference is insignificant; if anything, fewer but longer defaults tend to trigger higher default premia.
- Alternative functional forms for MEM2 tested:
  - quasi-hyperbolic discounting, hyperbolic discounting, exponential discounting, inverse (geometric) discounting.
  - MEM1 remains significant across alternatives; MEM2 results vary in sign consistent with functional form but regression fits are no better than linear baseline.
  - evidence supports sticking to linear MEM2; default premium is higher rather than lower under alternatives.

### Default premium (DP) estimates and key contrasts
- DP defined as in equation (5); Figures 1 and 2 summarize cross-country mean DP for pre- and post-WWII sub-samples using favored specification (no time effects; removing most statistically insignificant variables).
- Key DP findings:
  - sizeable DP in first few years after market re-entry; DP does not die out thereafter although it becomes very small for the bottom quartile.
  - model-uncertainty robustness: median DP computed across eight alternative specifications for each sub-period yields positive and sizeable DP with corroborating error bands (Pesaran and Timmermann (2007) approach).
- Comparison between DP and raw sovereign spreads (Figures 3–6):
  - median DP and median sovereign spread differ non-trivially.
  - failing to net out publicly-observable fundamentals leads to mismeasurement:
    - underestimation of DP at market re-entry by as much as 150 bps in pre-WWII era;
    - overestimation by over 50 bps in post-1970 era.
  - incorrect inference example: assuming DP decayed more rapidly post-WWII would be misleading (300 bps vs. 150 bps between first and third year after settlement).
- Additional qualitative point:
  - DP can jump, consistent with asymmetric information and default as a discrete signal; authors decompose spread changes into changes in publicly-observed fundamentals vs. changes in DP.

*Italic: Content unit summarized from _wp15167 - 5.1    Econometric Controls (source PDF: _wp15167 - 5.1    Econometric Controls).*

### 5.4    Fundamentals vs.  Default Premium

### 5.4    Fundamentals vs.  Default Premium

### Decomposition of sovereign spreads: fundamentals vs. default premium (DP)
- Combining estimated parameters with equation (7) gauges how much of the change in the sovereign spread is accounted for by publicly-observable fundamentals versus the DP and the estimated error term.
- Pre-WWII (1870-1938): the default premium accounts for between 35 to 50% of the spread within five years after debt settlement.
- Post-1970: the contribution of the default premium is even higher on impact, reaching up to 60%.
- The contribution of fundamentals to changes in the market spread is strikingly stable across samples.
- Figures referenced: Figures 7-8 illustrate the mean spread decomposition for pre-WWII and post-WWII samples respectively (cross-country mean fitted values of Fundamentals, Fβ, and DP).

### Serial defaulters vs. non-serial defaulters
- Spread decomposition is broken down between countries that defaulted only once and those that defaulted more than once, computed separately for pre- and post-WWII data.
- Figures 9-12 show:
  - Both the spread and the DP are larger for serial defaulters.
  - Estimation error is low in both cases (gauged by the gap between the spread in dotted lines and the top of the vertical bars for each year).
  - Serial defaulters typically face costlier borrowing for the same set of fundamentals compared to non-serial defaulters.
- The paper finds no significant difference in DPs between countries that defaulted more often but for shorter periods vs. those that defaulted less often but for longer periods: what matters is the total number of years in default and how recent was the last default.
  - Implication: a serial defaulter pays a higher DP because it stays in default for a higher percentage of its time as sovereign.
- These results hold for both the pre-WWII and the post-1970 periods.

### Economic significance and persistence of the default premium
- The paper argues the interest rate cost of default has been previously underestimated.
- Illustration for the average post-1970 defaulter (mean public debt/GDP ratio of 50 percent and which never defaulted before):
  - Point estimates of the DP imply an extra interest cost of 2 percent of GDP upon market re-entry, tapering to 1 percent of GDP five years hence.
  - A serial defaulter with otherwise similar characteristics would face an even higher interest bill.
- The paper attributes larger and more persistent DP estimates to:
  - A broader metric of the DP (comprising the non-linear effects of the post-settlement dummies and slowly-decaying memory variables).
  - A much broader cross-country panel (longer time-series and wider cross-section) than previous studies.
    - Longer time-series is important to capture slowly decaying DP effects.
    - A broader cross-section avoids sample selection pitfalls caused by idiosyncratic periods (e.g., syndicated banking lending era mid-1970s/early 1980s; bright emerging market outlook 2002-2007).
  - Subjecting estimates to a wider variety of controls (including the actual size of haircuts) and averaging across alternative specifications to identify anomalies and obtain robust DP measures.

### Two additional novel results highlighted
- Changes in publicly-observable or "common-knowledge" fundamentals typically account for less than one-half of the changes in the spread between pre-default and debt settlement.
  - This underscores the importance of the DP in accounting for large shifts in the spread and in borrowing costs around major sovereign credit events.
- The DP depends on total years in default and recency of last default rather than on frequency vs. duration tradeoffs of default spells.

### Overall interpretation and policy-relevant implication
- The findings point to a positive, sizeable, and persistent default premium that rises on market exclusion spells.
- This helps rationalize:
  - Why governments typically try hard not to default.
  - Why, when they do default, they seek early renegotiation.
- Quantitatively relevant magnitudes cited:
  - Default premium accounts for between 35 to 50% of the spread within five years after debt settlement in 1870-1938.
  - Default premium contribution reaches up to 60% on impact in the post-1970 period.
  - For an average post-1970 defaulter with mean public debt/GDP ratio of 50 percent and no prior defaults: extra interest cost of 2 percent of GDP on market re-entry, tapering to 1 percent of GDP five years later.

*Source: _wp15167 - 5.4    Fundamentals vs.  Default Premium*

### Section  4,  partial  re-scheduling  and  debt  negotiation  attempts  following  the  original

### _wp15167 - Section  4,  partial  re-scheduling  and  debt  negotiation  attempts  following  the  original

### Classification of sovereign credit events and default length
- Partial re-scheduling and debt negotiation attempts following the original default decision which, nevertheless, do not result in a complete or near complete settlement of arrears, are not classified as new default or a final settlement of the debt.
- The years between the initial default and full (or near full) settlement of arrears as per the S&P definition are taken as the length of the default.
- The approach follows Sutter (1992), Beim and Calomiris (2001), and Reinhart and Rogoff (2009).
- The framework does not distinguish between “voluntary” and “involuntary” defaults or “market-friendly” vs. “market-unfriendly” reschedulings; focus is on the breach in the original contractual terms of the debt agreement.

### Complementary sovereign credit event definition based on IMF financing
- A complementary definition of sovereign credit events is based on large resort to multilateral financing.
- Events that imply resort to 200% or more the respective country’s quota at the IMF are defined as credit events.
- The share of IMF’s credit to country members is computed from the IMF’s International Financial Statistics (IFS) database (publicly available online).
- Table A1 reports the exact country/year dates of all the credit events in the series.

### Construction of credit history indicators (A.3)
- Illustration Case 1: Single Default
  - Suppose sovereign history starts in 1850 for country i. In 1898 the country defaults and it settles its debt with creditors in 1902. There is no default thereafter.
  - MEM1_i,t = 0 for all t < 1898
  - MEM1_i,t = (t − 1898) / (t − 1850) for 1898 ≤ t ≤ 1902
  - MEM1_i,t = (1902 − 1898) / (t − 1850) for all t > 1902
  - MEM2_i,t = 0 for all t < 1898
  - MEM2_i,t = t − 1898 for all t > 1898
  - For a window of m = 2, the two DS(j)_i,t dummies are defined as:
    - DS(1)_i,t = 1 for t = 1903 and DS(1)_i,t = 0 for t ≠ 1903
    - DS(2)_i,t = 1 for t = 1904 and DS(2)_i,t = 0 for t ≠ 1904
- Illustration Case 2: Serial default
  - Using the same initial history but with a second default in 1928 and settlement in 1935:
  - MEM1_i,t = 0 for all t < 1898
  - MEM1_i,t = (t − 1898) / (t − 1850) for 1898 ≤ t ≤ 1902
  - MEM1_i,t = (1902 − 1898) / (t − 1850) for 1902 < t ≤ 1928
  - MEM1_i,t = (1902 − 1898 + t − 1928) / (t − 1850) for 1928 < t ≤ 1935
  - MEM1_i,t = (1902 − 1898 + 1935 − 1928) / (t − 1850) for all t > 1935
  - MEM2_i,t = 0 for all t < 1898
  - MEM2_i,t = t − 1898 for 1898 ≤ t ≤ 1902
  - MEM2_i,t = t − 1928 for t > 1928 (MEM2 is reset upon the second default)
  - Debt settlement dummies in this example:
    - DS(1)_i,t = 1 for t = 1903, 1936 and DS(1)_i,t = 0 otherwise
    - DS(2)_i,t = 1 for t = 1904, 1937 and DS(2)_i,t = 0 otherwise

### Data sources and construction for key series (A.4–A.16)
- GDP data
  - 1870-1939: Nominal and Real GDP data are Mitchell (2013) and Maddison (2003), complemented with Barro and Urzua (2008), with exceptions:
    - Argentina, Brazil, Chile and Mexico: Aiolfi, Catão, and Timmermann (2011)
    - Greece: new estimates provided by George Kostelenos (Money and Output in Modern Greece, 1858-1938, Athens, 1995)
    - Russia: net national product estimate from Paul Gregory, Russian National Income, 1885-1913 (Cambridge University Press, 1983), Table 3.1, pp. 56-7, (“variant 1”)
    - Spain: Prados de la Escosura, Leandro 2003, El Progreso Economico de España, 1850-2000
    - Venezuela: Baptista, Asdrœbal, 1997, Bases Cuantitativas de la Economia Venezolana, 1830-1995
    - Nominal GDP from Obsfeld and Taylor (2003) except for above countries; New Zealand from Rankin, Keith, 1992; Hungary and Yugoslavia from Mitchell, Brian, 2003
  - 1970-2011: IMF’s International Financial Statistics database
- Total Government Debt
  - 1870-1939: Chief source Obstfeld and Taylor (2003), with country exceptions (Aiolfi et al. 2011; Dimitrova and Ivanov (2014); Lazaretou (1993); Kelly (1998); Stoenescu et al. (2014); Hinic, Durdevic, and Sojic (2014); Baptista (1997); League of Nations Yearbooks; Reinhart and Rogoff (2009))
  - 1970-2011: IMF’s World Economic Outlook and World Bank’s World Development Finance databases; where conflict or missing information, Abbas et al (2010), IMF working paper 10/245 used
- External Government Debt
  - 1870-1939: Chief sources Flandreau and Zulmer (2004, Table DB3, 1880-1913) and League of Nations Yearbooks for 1919-1939; numerous country-specific sources listed in the text
  - 1970-2011: World Bank’s Global Development Finance database; for advanced countries assumed externally issued debt was zero except when under IMF program (then debt to the IMF deemed to represent all external debt)
- Fixed Exchange Rate Regime (Fixed)
  - 1870-2013: Dummy = 1 when country was on the gold standard. Sources: Catão and Solomou (2005) for 1870-1913; Obstfeld and Taylor (2003); Officer, Lawrence, “Gold Standard”
  - 1970-2011: Fixed exchange rate dummy constructed based on the IMF classification (categories “1” and “2”), as compiled in Reinhart, Rogoff and Ilzetzki, 2009 (updated by the authors based on IMF information)
- Nominal interest rate in the world (i_WORLD_t−1)
  - 1870-1939: GDP weighted average of the (short-term) money market interest in the UK and the US (the latter from 1920) deflated by CPI inflation. Nominal interest source: Holmer and Silla, A History of Interest Rates (1996). CPI inflation: Catão and Solomou (2005) for 1870-1913; Obstfeld and Taylor (2003) and Global Financial Data for post-1914. GDP data from Maddison (1995).
  - 1970-2011: Computed same as for 1870-1939 but including all G-7 economies plus Australia. Money market rates, CPI and inflation and US dollar GDP data from IMF’s International Financial Statistics.
- Stock Market Volatility
  - 1870-1939: Standard deviation of month-to-month change over the 12-month annual window for the London stock market index from Global Financial Data for 1870-1918; for 1919-1939, the US stock market index from Global Financial Data used.
  - 1970-2011: Measured by the VIX/VOX index compiled in Philips, Steve et al., “External Balance Assessment Methodologies”, IMF working paper 13/296 from 1986. Pre-1986 the index was spliced based on the S & P 500 index actual volatility, calculated as standard deviations of monthly changes as for 1870-1939.
- Exports and Imports
  - 1870-1939: Mitchell, B.R. International Historical Statistics
  - 1970-2011: IMF’s International Financial Statistics
- Terms of Trade
  - 1870-1939: Sources include Blattman, C. J. Hwang and J. Williamson (2007) and Catão and Solomou (2005) online appendix; some Latin American countries from Base de Datos de Historia Económica de América Latina Montevideo-Oxford
  - 1970-2011: IMF’s International Financial Statistics and World Economic Outlook databases, various vintages, as compiled in Catão and Milesi-Ferretti (2014)
- Foreign Exchange Reserves
  - 1870-1939: Advanced countries mostly from Flandreau and Zummer (2004), complemented by numerous country-specific sources listed in the text
  - 1970-2011: IMF’s International Financial Statistics
- Broad Money (M2)
  - 1870-1939: Mitchell (2013) and Flandreau and Zummer (2004), complemented with country-specific sources
  - 1970-2011: IMF’s International Financial Statistics, World Economic Outlook, and World Bank’s Global Development Finance databases, as revised and combined by Catão and Milesi-Ferretti (2014)
- Government Expenditures and Revenues
  - 1870-1939: Mitchell (2013) and Flandreau and Zummer (2004), complemented with country-specific sources
  - 1970-2011: IMF’s International Financial Statistics, World Economic Outlook, and World Bank’s Global Development Finance databases, as revised and combined by Catão and Milesi-Ferretti (2014)
- Polity index (Polity)
  - Available at: http://www.icpsr.umich.edu/icpsrweb/ICPSR/studies/6695 and http://www.systemicpeace.org/polity/polity4.htm
- Haircuts on Foreign Debt
  - Cruces and Trebesch (2013), updated to 2014 as available from https://sites.google.com/site/christophtrebesch/, and Reinhart and Trebesch (2014)

*Italic: Content derived from _wp15167 - Section  4,  partial  re-scheduling  and  debt  negotiation  attempts  following  the  original.*

### References

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### Financial crises, contagion, and early warning systems
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### Banking, financial institutions, and macro-financial linkages
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### Methodology, risk pricing, and macroeconomic analysis
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*Source: _wp15167 - References*

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_Source: https://www.imf.org/-/media/websites/imf/imported-full-text-pdf/external/pubs/ft/wp/2015/_wp15167.pdf_
