Currency exchange rate is an important factor, because of the changes. Is the flow of income from export and import from and expenditures flow in and out of the flow of capital between countries.
Exchange rates have changed because the key factor. Is the revenue stream from exports and expenditure on imports. And the current inflow of international capital.
Exchange rate changes because of the essence. Is the current export revenue and expenditure from imports. And the flow in and out of Capital International.