Fluctuations in exchange rates are usually caused by actual monetary flows as well as by expectations of changes in monetary flows. These are caused by changes in gross domestic product (GDP) growth, inflation (purchasing power parity theory), interest rates (interest rate parity, Domestic Fisher effect, International Fisher effect), budget and trade deficits or surpluses, large cross-border M&A deals and other macroeconomic conditions. Major news is released publicly, often on scheduled dates, so many people have access to the same news at the same time. However, large banks have an important advantage; they can see their customers' order flow.
Traders can also make short trades (also known as sell trades), where they sell a Forex CFD at the ask price and, once the price drops, buy it at a lower bid price, and profit on the difference. In this case, if the GBP/USD ask price was 1.32265, and the trade closed at the price of 1.31203, the difference would be 0.01062, or 106.2 pips (which would amount to 1,062 USD in profit).
Day trading also deserves some extra attention in this area and a daily risk maximum should also be implemented. This daily risk maximum can be 1% (or less) of capital, or equivalent to the average daily profit over a 30 day period. For example, a trader with a $50,000 account (leverage not included) could lose a maximum of $500 per day under these risk parameters. Alternatively, this number could be altered so it is more in line with the average daily gain (i.e., if a trader makes $100 on positive days, they keeps their losses close to $100 or less).
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.