Условие Маршалла—Лернера

A devaluation of the currency will improve the balance of trade if the sum of the price elasticities of demand for exports and imports (in absolute value) is greater than 1

An appreciation of the currency will improve the balance of trade if the sum of the price elasticities of demand for exports and imports (in absolute value) is greater than 1

A devaluation of the currency will worsen the balance of trade if the sum of the price elasticities of demand for exports and imports (in absolute value) is greater than 1

An appreciation of the currency will improve the balance of trade if the sum of the price elasticities of demand for exports and imports (in absolute value) is greater than 1