Price Prediction

Source details

Article: Price Prediction
Author: FRANCESCO GRIGOLI, senior economist in the IMF’s Research Department.
Publication: F&D Magazine, March 2023
Core assertion: Today’s inflation expectations are likely to become tomorrow’s actual inflation.

Expectations shape consumption timing:
- If expected price change = 10 percent (car from $20,000 to $22,000), consumers buy now, raising demand and prices.
- If expected price change = –10 percent (car from $20,000 to $18,000), consumers delay purchases, lowering demand and prices.
- Expectation of 0 implies no expected price change.
Expectations influence wage setting and can trigger a “wage-price spiral”:
- Workers expecting a 10 percent price increase will seek at least a 10 percent pay rise.
- Firms facing higher wage costs may raise prices, reinforcing inflation.

Common methods:
- Household surveys (example: University of Michigan monthly survey, at least 600 households in the United States).
- Professional forecaster surveys (analysts at banks or financial firms).
- Business surveys (responses from stores and firms that set prices).
Heterogeneity in expectations:
- Professional forecasters are usually most accurate but disagree, especially where prices are volatile.
- Households and firms show greater disagreement due to “rational inattention” and reliance on frequently purchased items (for example, gasoline) as price signals.
- A simple average of responses can mask important variation across groups.

Central bank objective: anchor inflation expectations to the inflation “target.”
Policy horizon: focus on the medium term, typically two to three years.
Monetary tools to influence expectations:
- Raise short-term policy interest rate and influence longer-term interest rates to make borrowing more expensive, reduce spending, and lower inflation expectations.
- Communication (forward guidance) to signal future policy direction:
- Forward guidance became widespread when policy rates were stuck at or close to zero for the decade or so after the 2008–09 financial crisis.
- Used to stimulate demand and push inflation expectations back up to target when rates were constrained.

Lack of credibility scenario:
- If inflation expectations are above target and the central bank lowers interest rates, cheaper credit would boost demand and keep inflation above target longer.
- Public would infer the central bank is not serious about price stability, reinforcing high expectations and prolonging inflation.
Credible central bank scenario:
- If the public believes the central bank will restore price stability, people may not change expectations over the two- to three-year policy horizon even when inflation deviates from target.
- Building credibility requires consistent policy actions, possibly involving difficult trade-offs (for example, raising interest rates even when the economy is weak and unemployment is rising).
- Once expectations are securely anchored, the central bank can be less aggressive and still achieve price stability, allowing focus on secondary objectives such as economic growth and employment.

Inflation expectations are a leading indicator of future inflation and central to monetary policy effectiveness.
Central banks should:
- Aim to anchor medium-term expectations (two to three years) to the inflation target.
- Use interest rate policy and influence longer-term rates to control demand.
- Employ clear communication and forward guidance to shape expectations, especially when conventional rates are constrained.
- Maintain consistent actions aligned with the price-stability mandate to build and preserve credibility, accepting that this may require trade-offs with short-term economic conditions.

F&D Magazine — Price Prediction (Francesco Grigoli), March 2023

Back2basics2price Prediction
- Back2basics2price Prediction (Markdown version)
- Back2basics2price Prediction (PDF)