What explains why exchange rate changes in the short run are larger than in the long run?

Question

BlackTom AI · Accepted Answer

Short-run exchange rates are dominated by financial market dynamics—large, rapid flows of capital and changes in expectations—while long-run rates reflect real economic fundamentals such as relative prices and trade flows.

1. Relevant knowledge points and concepts
- Asset-market view vs. goods-market view: short-run exchange rates respond mainly to financial capital flows and expectations; long-run rates are governed by real variables (relative demand for goods and services, purchasing power parity (PPP), current account adjustments).
- Speculative and portfolio flows: investors shift capital quickly in response to news, creating volatility.
- Feedback from trade: currency appreciation reduces export competitiveness and increases imports, which tends to push the exchange rate back toward equilibrium over time.

2. Step-by-step reasoning
- Step 1: A news event or interest-rate shock causes investors/speculators to reallocate portfolios, rapidly altering demand for currencies; this produces large short-run movements.
- Step 2: These short-run movements change relative prices of domestic and foreign goods (real exchange rate), affecting trade flows and demand for currencies for transactions.
- Step 3: Over months/years, trade and price adjustments (and PPP tendencies) counteract some of the initial financial-driven moves, partially reversing the short-run swings.
- Step 4: Result: short-run changes are larger and more volatile; long-run changes are smaller because fundamentals reassert themselves.

3. Calculations
No numerical calculation is required; the explanation is qualitative and rests on dynamic adjustment mechanisms (no intermediate arithmetic).

4. Why the correct answer is correct
Both given mechanisms operate: speculative investor behavior causes large short-run swings, and slower adjustments in demand for goods and services cause partial reversal in the long run. Together they explain the observed pattern.

5. Why other options are incorrect
- “Neither of these” is wrong because empirical and theoretical evidence supports both channels.
- Each single-statement option is incomplete: investor/speculator explanation alone ignores later trade-driven adjustments; the goods-demand explanation alone doesn’t explain why initial short-run swings are so large.

6. Conclusion
Therefore, “both of these” is the correct choice, matching the provided answer.

What explains why exchange rate changes in the short run are larger than in the long run?Single choice

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