Inflation levels and trends: Typically a currency will lose value if there is a high level of inflation in the country or if inflation levels are perceived to be rising. This is because inflation erodes purchasing power, thus demand, for that particular currency. However, a currency may sometimes strengthen when inflation rises because of expectations that the central bank will raise short-term interest rates to combat rising inflation.
The simplest answer is that the forex is open for trading all the time, but that the specific hours it opens and closes at any given location depending upon where you are in the world. The base reference time for all opening and closing times worldwide is Greenwich Mean Time, commonly abbreviated GMT. Many websites devoted to clarifying forex business hours describe the opening and closing times with three or four significant examples, usually

a MARKET engaged in the buying and selling of FOREIGN CURRENCIES. Such a market is required because each country involved in INTERNATIONAL TRADE and FOREIGN INVESTMENT has its own domestic currency, and this needs to be exchanged for other currencies in order to finance trade and capital transactions. This function is undertaken by a network of private foreign exchange dealers and a country's monetary authorities acting through its central banks.
The forex market is the largest market in the world with an average trading value over $5 trillion per day. It has no centralized marketplace where transactions are conducted. Forex trading is carried out electronically over-the-counter (OTC), meaning that all trading transactions are performed via computer by traders and other market participants over the world.
For example, if Company A is based in the U.S. and wishes to use the EUR/USD trading pair to buy Euros to pay employees located in Europe, they would tap the forex market. However, if the price quote rapidly changes between several hours and Company A is set to exchange a large sum of USD for EUR, then a small adverse price fluctuation could have a significant impact on their bottom line.
One unique aspect of this international market is that there is no central marketplace for foreign exchange. Rather, currency trading is conducted electronically over-the-counter (OTC), which means that all transactions occur via computer networks between traders around the world, rather than on one centralized exchange. The market is open 24 hours a day, five and a half days a week, and currencies are traded worldwide in the major financial centers of London, New York, Tokyo, Zurich, Frankfurt, Hong Kong, Singapore, Paris and Sydney - across almost every time zone. This means that when the trading day in the U.S. ends, the forex market begins anew in Tokyo and Hong Kong. As such, the forex market can be extremely active any time of the day, with price quotes changing constantly.
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