Why Can the Trade Balance Worsen After Depreciation?
Trade balance means export revenue minus import expenditure in the stated currency. Each payment depends on price times quantity. After depreciation, unchanged foreign prices cost more domestic currency. Existing contracts and few substitutes may keep import quantities fixed initially.
Builds on: How Can Policy Reduce a Current-Account Deficit?
What you will learn
- Depreciation raises the domestic price of imports before quantities may adjust.
- Distinguish an improving trade balance from a surplus
Essential definitions
- Marshall–Lerner condition
- Under the standard model starting from balanced trade, depreciation improves the trade balance if the sum of absolute export- and import-demand price elasticities exceeds one, subject to supply and pricing assumptions.
- J-curve
- A possible initial worsening followed by improvement in the trade balance after depreciation.
- Imported inflation
- Domestic price pressure arising through higher import prices or imported input costs.
Begin with the payment arithmetic
Trade balance means export revenue minus import expenditure in the stated currency. Each payment depends on price times quantity. After depreciation, unchanged foreign prices cost more domestic currency. Existing contracts and few substitutes may keep import quantities fixed initially.
Suppose 100 imported units cost 10 domestic units each: the bill is 1,000. After depreciation raises the price to 12, the same contracted quantity costs 1,200. If exporters hold domestic prices and quantities unchanged, their domestic revenue initially stays unchanged, so the trade balance worsens. The earlier Marshall–Lerner condition concerns responsive quantities under stated assumptions, not an immediate promise.
Read the J-curve over time
The horizontal axis is time after depreciation; the vertical axis is the trade balance in domestic currency. The zero line separates surplus above from deficit below. Follow the curve down for the initial deterioration, then up for the possible later recovery. The displayed curve remains below zero: improvement can mean a smaller deficit rather than a surplus.
Over time, buyers may substitute domestic products for imports and foreign customers may buy more exports. If imports later fall to 80 units at price 12, their bill is 960. Export revenue must also be checked before judging the full balance. Elasticities, supply capacity, contracts and firms' pricing decisions determine whether the recovery occurs. Income payments and transfers can move differently, so an improved trade balance need not produce an equal improvement in the whole current account.
Hypothetical import-bill adjustment
- An economy initially imports 100 units at 10 domestic currency units each: expenditure = 1,000.
- After depreciation, the domestic import price rises to 12 while contracted quantity initially remains 100: expenditure = 1,200.
- If quantity later falls to 80, expenditure becomes 960. Export revenue must also be considered to assess the trade balance.
A dearer import price can initially outweigh volume adjustment; the full trade-balance result cannot be inferred from price alone.
The J-curve and delayed trade adjustment
After depreciation, a higher domestic import bill can worsen the trade balance before quantities adjust. Later improvement is conditional on responsiveness, including the Marshall–Lerner assumptions.
How to read this diagram
- Put time after depreciation horizontally and trade balance vertically.
- Mark zero and the initial balance.
- Draw an initial dip followed by a recovery; distinguish improvement from reaching a surplus.
On a small screen, scroll the graph horizontally to read all labels.
Assumptions and limits: Illustrative time path, not a forecast. Balance is measured in domestic currency; no guaranteed crossing into surplus.
Apply and evaluate
- The J-curve is conditional, not a prediction that every depreciation must follow this path.
- Check demand elasticities, firms’ ability to expand output and contracts before forecasting improvement.
Common misconceptions
- Depreciation does not guarantee an immediate improvement in the current account.
- An appreciating currency does not mechanically determine financial inflows; expected future returns and risk matter.
Knowledge check
Why can the trade balance worsen just after depreciation?
What to remember
Depreciation raises the domestic price of imports before quantities may adjust. A later improvement depends on export and import responses, so the J-curve is a possible path rather than a guaranteed outcome.
Completion records your reflection, not a test score.
Lessons in this section
- What Is the Balance of Payments?
- What Goes in the Current Account?
- How Do We Calculate the Current Account Balance?
- How Do the Capital and Financial Accounts Connect?
- Why Do Persistent Current-Account Imbalances Matter? · HL
- How Can Policy Reduce a Current-Account Deficit? · HL
- Why Can the Trade Balance Worsen After Depreciation? · HL
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