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they are techniques used to measure the success by a devaluation of currency. Marshall Lerner is a condition that states that the devaluation of currency will only be successful if the sum of the elasticities of imports and exports are GREATER THAN 1. J curve is similar to the marshal lerner, but here, as soon as the currency is devalued, the current account goes in a deficit in the short run, but as time passes the deficit turns into a surplus in the long run! simple as that!Can somebody explain marshall lerners and J curve? :/