Commercial companies One of the major participants in this market are real sector companies to be purchased with foreign exchange various types of goods or services. However, its impact on the market, at least in the short term, is small. As was mentioned above, trade flows are an important factor in long-term direction of a coin. Some multinational companies can have an unpredictable impact when their positions, often very large, have been covered due to exposures that are not widely known by other market participants. Central banks also play an important role in foreign exchange markets. Its main objective is to control money supply, inflation, and / or interest rates of the currency of your country, and often impose exchange rates and often even use their reserves to stabilize the market. The expectation or rumor of central bank intervention might be enough to stabilize a currency.However, central banks do not always achieve their objectives. The market can easily overwhelm any central bank. This happened in the 1992-93 debacle of the Exchange Rate Mechanism, and more recently in the Asia-Pacific. There are now companies specializing in the participation and support to the various participants in this market which may offer different types of services. In front are the “brokers” or intermediaries, which are entities that offer the possibility of opening an account in a particular currency and through purchase and sales orders, issued under different channels, allowing the investor to accrue earnings advantage of fluctuating exchange value between the currencies in contrast to one another.These companies, given their importance in the financial system, are usually subject to various controls and audits, however, when speaking of the financial intermediary or “broker”, it is recommended that before choosing any investigation into the strength and path company which will develop the activity and consider the legality under which it is governed. No less important are the operating companies or managed account or “money management”, where could include mutual funds that meet the capital of a number of investors in order to enter the market with a strong capital not manage their own but are given to the control of the institution, for his efforts which generates returns in percentage are distributed among the contributors to the fund. These companies are subject to risk inherent in capital speculation and may even lose all or part of the capital invested.When choosing an alternative of this nature is very important that the company complies with the criteria of experience, professionalism, transparency and risk policies for this kind of activity. On the other side, companies are focused on education in this market or those who develop applications which is the case of the creators and distributors of automatic systems: a software programmed to buy and sell orders according to mathematical calculations which was scheduled, or indicators constructed from mathematical formulas that help to read the movement of prices in certain periods.