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, including the
balance of trade,
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. And the other way around, if there is an inflow of foreign currency to a country, it creates demand for the home currency. This results in the appreciation of the home currency. For example, starting in May 2022, because of the war in Russia and the partial military mobilization, a lot of Russians went to live in Armenia. Since Russians brought a lot of foreign currency with them, especially dollars, it created an oversupply of dollars, therefore the price of dollars started to fall, and it depreciated. Contrary to that, there was a high demand for the Armenian dram, the home currency, since the Russian tourists had to exchange their dollars to drams to be able to buy products from local markets. Therefore, the Armenian dram has appreciated against the dollar. The appreciation of the Armenian dram still continues to grow and expectations of further inflation of foreign currencies still remain high because of the continuous inflow of international visitors and tourists. Another cause of appreciation (or depreciation) of a currency is speculative movements of funds in the belief that a currency is under- (or over-)valued and in anticipation of a “correction”. Such movements may in themselves cause the value of a currency to change. A longer-run trend of appreciation (or depreciation) is likely to be caused by home country
inflation being lower (or higher) on average than inflation in other countries, according to the principle of long-run
purchasing power parity. ==Economic effects==