Marshall-Lerner condition is that the payments deficit will be improved as a result of currency depreciation only if_ .

A.the sum of elasticity of demand for goods import and that for goods export equals one.

B.the sum of elasticity of demand for goods import and that for goods export is less than one.

C.the sum of elasticity of demand for goods import and that for goods export is larger than one.

D.the sum of elasticity of demand for goods import is greater than that for goods export.

正确答案：the sum of elasticity of demand for goods import and that for goods export is larger than one.