A currency's immediate response exceeds its eventual long-run adjustment, creating a temporary reversal path after a shock.
Exchange rate overshooting occurs when a currency’s immediate response to an economic or policy shock goes beyond its eventual long-run change, after which part of the initial move reverses. It is a model of short-run adjustment, not a claim that every large currency move is irrational or will reverse.
The classic explanation is associated with economist Rudiger Dornbusch. It combines fast financial markets with sticky prices in goods and labor markets.
Consider an unexpected monetary-policy tightening. Domestic interest rates may rise quickly, while the domestic price level changes little at first. Demand for domestic-currency assets can then push the currency to a stronger level than its estimated long-run response. If the interest-rate advantage is expected to fade, the currency can subsequently depreciate from that initial peak toward its longer-run level.
The direction reverses for an expansionary shock in the simplest version of the model. A currency may depreciate beyond its eventual level and then appreciate partway back as prices and other variables adjust.
| Stage | Fast-moving variable | Slow-moving variable | Possible exchange-rate path |
|---|---|---|---|
| Before the shock | Asset prices reflect the old outlook | Goods prices reflect the old equilibrium | Currency is near its starting level |
| Immediate response | Interest rates and exchange rates jump | Many prices remain sticky | Currency moves beyond the estimated new long-run level |
| Transition | Rate differentials and expectations evolve | Wages and goods prices begin adjusting | Part of the initial currency move reverses |
| Longer run | Financial prices settle around new conditions | Broader prices have adjusted | Currency approaches its estimated long-run level |
This is an analytical sequence, not a fixed timetable. Adjustment can be interrupted by new shocks, changing risk premiums, intervention, capital-flow restrictions, or revised expectations.
Assume an exchange rate is quoted as domestic-currency units per unit of foreign currency. A higher number therefore means a weaker domestic currency.
The expected long-run depreciation is 8%:
(10.80 / 10.00 - 1) x 100 = 8%
The immediate depreciation is 12%:
(11.20 / 10.00 - 1) x 100 = 12%
Relative to the estimated endpoint, the initial move overshoots by 0.40 exchange-rate units. If the model is broadly right, the rate would later decline from 11.20 toward 10.80, meaning the domestic currency appreciates from its weakest point even though it remains weaker than before the shock.
The example is deliberately mechanical. In practice, analysts do not know the eventual rate in advance, and new information can change it.
| Concept | What it describes | Does reversal define it? |
|---|---|---|
| Exchange rate overshooting | A short-run move beyond an eventual level after a shock | Yes, partial movement back is central to the concept |
| Exchange rate misalignment | A gap between an observed rate and a model-based reference level | No; the gap can persist or the estimate can change |
| Currency volatility | The size or frequency of exchange-rate changes | No; volatility says nothing about equilibrium |
| Currency depreciation | A fall in a currency’s market value under a floating rate | No; depreciation can be temporary or persistent |
| Currency devaluation | An official reduction in a fixed or managed value | No; it is a policy action rather than a market path |
Overshooting can affect a firm’s transaction exposure even when its longer-term exchange-rate assumption is unchanged. A sharp temporary move may alter collateral values, margin requirements, hedge effectiveness, import costs, export receipts, and the local-currency value of foreign debt.
For portfolio analysis, the path matters as much as the endpoint. A position can suffer a margin call during an overshoot even if the exchange rate later retraces. For corporate treasury, a forecast that focuses only on a year-end rate can miss liquidity demands arising between reporting dates.
Evidence of a reversal is not proof of the classic mechanism. The Federal Reserve has published research finding that empirical support depends on identification choices and that uncovered interest parity can deviate substantially. Treat the model as a disciplined framework, not a universal law.
The eventual exchange rate is unobservable when the initial move occurs. Analysts can mistake a permanent change in fundamentals for a temporary overshoot, or label a normal risk-premium adjustment as excessive. Sticky-price models also simplify market structure, policy responses, capital controls, balance sheets, and investor risk aversion.
An apparent overshoot can deepen rather than reverse if a second shock arrives. Leveraged positions are especially exposed because being directionally right about the eventual level does not prevent losses or forced liquidation along the path.