How Can We Compare Exchange-Rate Systems?
A credible fixed rate reduces uncertainty for trade receipts and foreign-currency contracts. Pegging to a low-inflation currency may also help anchor inflation expectations. The benefit depends on confidence that the authorities can maintain the commitment.
Builds on: How Are Fixed and Managed Exchange Rates Maintained?
What you will learn
- Fixed rates trade flexibility for a stability commitment; floating rates allow adjustment but can be volatile.
- Explain why a credible peg still has costs
Essential definitions
- Exchange-rate risk
- Uncertainty about the domestic value of future foreign-currency receipts or payments.
- Reserve adequacy
- Whether available foreign reserves can meet intervention and external-payment needs.
Benefits and costs of a fixed commitment
A credible fixed rate reduces uncertainty for trade receipts and foreign-currency contracts. Pegging to a low-inflation currency may also help anchor inflation expectations. The benefit depends on confidence that the authorities can maintain the commitment.
In the fixed diagram, price is foreign currency per domestic unit and quantity is domestic currency per period. A peg above the private-market intersection E requires purchases of excess domestic currency. Selling foreign reserves supports it but depletes reserves. Interest-rate increases may attract funds while reducing domestic spending. Expected devaluation can intensify selling, making defence harder.
Flexibility creates different trade-offs
Floating allows the rate to respond to trade and financial flows without a promise to defend one parity. With mobile international capital, it generally permits more independent interest-rate policy. A local recession can then favour a rate cut without requiring defence of a fixed price.
But speculative flows can cause volatile prices, imported inflation and uncertain investment returns. Hedging reduces some risk at a cost. Managed floating seeks to moderate disruptive changes while retaining flexibility; it still needs resources and a clear objective. Its diagram distinguishes E1 from final E2 after intervention rather than equating intervention with a guaranteed peg. Compare trade dependence, currency mismatches in debt, reserve capacity and the type of shocks. No system removes the need to adjust when underlying conditions change.
A policy conflict
- A domestic recession favours lower interest rates.
- The currency is under downward pressure at a fixed parity, so lower rates may encourage more outflows.
- The central bank must weigh reserve use, interest-rate defence or a change in the regime.
The exchange-rate commitment can constrain a domestic stabilization response.
Defending an overvalued fixed parity
At a peg above the market-clearing rate, private supply exceeds private demand. The central bank buys the excess domestic currency with foreign reserves to maintain the peg.
How to read this diagram
- Draw the private-market equilibrium E.
- Add the peg above it.
- At the peg mark private Qd and Qs; central-bank purchases must fill that gap.
E is the private-market equilibrium at 0.90. At the 1.00 peg, private Qs = 70 and Qd = 50. The central bank buys 20 million domestic units, spending 20 million foreign units.
On a small screen, scroll the graph horizontally to read all labels.
Assumptions and limits: The stated market curves exclude the intervention. Reserves are finite; expectations and interest rates are held fixed.
Managed exchange rate: resisting appreciation
After private demand rises, the central bank sells domestic currency and buys foreign currency. The added supply limits appreciation and increases foreign reserves.
How to read this diagram
- Shift D1 right to D2.
- Mark E1 at the original D1–S1 intersection and a hollow point at the floating outcome without intervention.
- Add official supply, shifting S1 to S2 and mark the final equilibrium E2 at D2–S2, below that floating rate.
Start at E1 (60 million, 0.90). Without intervention the demand increase would raise the rate to 1.00 at the hollow point. Official domestic-currency sales shift supply right, leaving E2 at 75 million and 0.95.
On a small screen, scroll the graph horizontally to read all labels.
Assumptions and limits: The illustration targets a rate between the original and new floating equilibria. It does not imply every managed float has a fixed target.
Apply and evaluate
- Stable nominal rates do not guarantee stable competitiveness if domestic inflation differs from partners.
- Floating provides flexibility but does not guarantee that exchange-rate changes are smooth or beneficial.
Common misconceptions
- Finite foreign reserves cannot defend every peg indefinitely.
- Managed floating is not the same as a permanently fixed parity.
Knowledge check
Why might a central bank raise rates during weak domestic growth under a peg?
What to remember
Fixed rates trade flexibility for a stability commitment; floating rates allow adjustment but can be volatile. The better choice depends on shocks, credibility, foreign debt and available adjustment tools.
Completion records your reflection, not a test score.
Lessons in this section
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