J-curve effect
Topic: Balance of Payments and Exchange Rates · NCERT: Beyond NCERT
Meaning
The J-curve effect describes how a country's trade balance moves after its currency depreciates. It first gets worse and then gets better. In the short run, trade contracts are already signed and buyers take time to switch suppliers. So import volumes hardly change, but each import now costs more in home currency, and the import bill rises. Over time, exports become more competitive and imports fall, so the trade balance improves. Plotted over time, the trade balance dips and then rises, like the letter J. The lasting improvement comes only if the Marshall-Lerner condition holds: the export and import demand elasticities, taken together, add up to more than 1.
Example
Suppose the rupee falls against the dollar. At first, India's oil and electronics bills in rupees rise at once, so the trade deficit widens. Months later, cheaper Indian goods win more orders abroad and costly imports are cut back, so the deficit narrows.
Don't confuse with
- Marshall-Lerner condition: the elasticity test that decides whether depreciation improves the trade balance at all. The J-curve describes the path over time.
Related concepts
- Fixed exchange rate
- Devaluation
- Revaluation
- Black market for foreign exchange
- Speculative attack
- Managed floating
- Forex intervention
- Crawling peg
- Currency board
- Impossible trinity