Investing in currencies is one of the most important and secure actions in the world, but in these times where the world is experiencing a deep financial crisis that went worst after the crisis mortgage in the United States, stability in the price of this money is becoming very volatile and unpredictable.
To invest in foreign exchange must be very confident of the choice that we are going to use, you probably already heard that in forex the buying and selling of foreign exchange are made in couples, ie you do not invest in a single currency, but in a couple consisting of Two types of currencies. The support offered by this form of investment in pairs is often an effective weapon against the risk associated with constant market fluctuations.
To invest in foreign exchange and get some security to support your investment exists an instrument called futures exchange. In this type of contract are two kinds of prices, a price cash, and the spot price. The first is that listed financial institutions based on supply and demand instant you get in the market.
The spot price, are currencies that will be delivered within 48 hours, your quote is determined by supply and demand in the interbank market, in this market participates all the authorized institutions to be engaged in the purchase and sale of foreign exchange.

The investing in currencies based on a futures contract basically recruit a date for an exchange rate of one currency against another, which will be ready to buy or sell a specified amount of amount. If when the time of expiring is not performed the operation, the loan is made by comparing differences or the exchange rate on the date of loan to the exchange rate at that contract.