Marshall learner condition
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It is often expected that a lower exchange rate will reduce a current account deficit.
The outcome will depend, in part, on the price elasticities of demand for both exports and imports.
Marshall Lerner condition
The Marshall-Lerner condition provides a simple rule to assess whether a change in the exchange rate can improve the current account.
The condition states that when the sum of the export and import price elasticities is greater than unity (ignoring the minus sign), a fall in the exchange rate can reduce a deficit and a rise in the exchange rate can reduce a surplus.
When, however, the export and import price elasticities of demand are both highly inelastic, summing to less than unity, a fall in the exchange rate can have the reverse effect of worsening a deficit (while a revaluation might increase a surplus).