The original demand for foreign exchange arose from merchants’ requirements for foreign currency to settle trades. However, now, as well as trade and investment requirements, foreign exchange is also bought and sold for risk management (hedging), arbitrage, and speculative gain. Therefore, financial, rather than trade, flows act as the key determinant of exchange rates; for example, interest rate differentials act as a magnet for yield-driven capital. Thus, the currency markets are often held to be a permanent and ongoing referendum on government policy decisions and the health of the economy; if the markets disapprove, they will vote with their feet and exit a currency. However, debates about the actual versus potential mobility of capital remain contested, as do those about whether exchange rate movements can best be characterized as rational, “overshooting,” or speculatively irrational.

Investors should stick to the major and minor pairs in the beginning. This is because it will be easier to find trades, and lower spreads, making scalping viable. Exotic pairs, however, have much more illiquidity and higher spreads. In fact, because they are riskier, you can make serious cash with exotic pairs, just be prepared to lose big in a single session too.

All forex trades involve two currencies because you're betting on the value of a currency against another. Think of EUR/USD, the most-traded currency pair in the world. EUR, the first currency in the pair, is the base, and USD, the second, is the counter. When you see a price quoted on your platform, that price is how much one euro is worth in US dollars. You always see two prices because one is the buy price and one is the sell. The difference between the two is the spread. When you click buy or sell, you are buying or selling the first currency in the pair.
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The most common type of forward transaction is the foreign exchange swap. In a swap, two parties exchange currencies for a certain length of time and agree to reverse the transaction at a later date. These are not standardized contracts and are not traded through an exchange. A deposit is often required in order to hold the position open until the transaction is completed.
When a trader opens a position at AvaTrade, he is not charged any other commissions beside the spread. The spread is the difference between the buy and sell price which is counted in pips – the fourth digit after the dot. For example if the buy price of EURUSD is 1.1123 and the sell price is 1.1120, then the spread is 3 pips. The spread charged for a position opened by a trader is the spread multiplied by the size of the position.
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The foreign exchange market may be left unregulated by governments, with EXCHANGE RATES between currencies being determined by the free interplay of the forces of demand and supply (see FLOATING EXCHANGE RATE SYSTEM), or they may be subjected to support buying and selling by countries' central banks in order to fix them at particular rates (see FIXED EXCHANGE RATE SYSTEM).
There are actually three ways that institutions, corporations and individuals trade forex: the spot market, the forwards market and the futures market. The forex trading in the spot market always has been the largest market because it is the "underlying" real asset that the forwards and futures markets are based on. In the past, the futures market was the most popular venue for traders because it was available to individual investors for a longer period of time. However, with the advent of electronic trading and numerous forex brokers, the spot market has witnessed a huge surge in activity and now surpasses the futures market as the preferred trading market for individual investors and speculators. When people refer to the forex market, they usually are referring to the spot market. The forwards and futures markets tend to be more popular with companies that need to hedge their foreign exchange risks out to a specific date in the future.