What causes the J curve effect?

What is the significance of the Marshall Lerner condition?

What is Marshall effect?

What does the Marshall Lerner condition state and what are its implications?

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Marshall–Lerner condition
The Marshall–Lerner condition is satisfied if the absolute sum of a country's export and import demand elasticities is greater than one. If it is satisfied, then if a country begins with a zero trade deficit, its balance of trade will improve when the country's currency depreciates.