how does a currency lose or gain value
Currency appreciation and depreciation In a floating exchange rate system, a currency's value goes up (or down) if the demand for it goes up more (or less) than the supply does. In the short run this can happen unpredictably for a variety of reasons, having to do with trade flows, speculation, or other factors in the international capital market. For example, a surge in purchases of foreign goods by home country residents will cause a surge in demand for foreign currency with which to pay for those goods, causing a depreciation of the home currency.
Current account A nation’s current account balance is influenced by numerous factors – its trade policies, exchange rate, competitiveness, forex reserves, inflation rate and others. Since the trade balance (exports minus imports) is generally the biggest determinant of the current account surplus or deficit, the current account balance often displays a cyclical trend. During a strong economic expansion, import volumes typically surge; if exports are unable to grow at the same rate, the current account deficit will widen. Conversely, during a recession, the current account deficit will shrink if imports decline and exports increase to stronger economies. The currency exchange rate exerts a significant influence on the trade balance, and by extension, on the current account. An overvalued currency makes imports cheaper and exports less competitive, thereby widening the current account deficit (or narrowing the surplus). An undervalued currency, on the other hand, boosts exports and makes imports more expensive, thus increasing the current account surplus (or narrowing the deficit). Nations with chronic current account deficits often come under increased investor scrutiny during periods of heightened uncertainty. The currencies of such nations often come under speculative attack during such times. This creates a vicious circle where precious foreign exchange reserves are depleted to support the domestic currency, and this forex reserve depletion – combined with a deteriorating trade balance – puts further pressure on the currency. Embattled nations are often forced to take stringent measures to support the currency, such as raising interest rates and curbing currency outflows.