The forex is the largest speculative market on the planet. It is so big that it covers the entire planet. The forex is not traded in just on location such as Chicago or New York or the major cities in Europe. The foreign currency exchange is traded almost everywhere in the world. Forex trading can be very lucrative for the small trader unlike many other markets. The forex is so big that it has what is called extreme liquidity. This exteme liquidity means that buying or selling a particular currency by any one person or group will have little impact on the market. In fact, a known fact of the forex is that even governments have a hard time in forcing a currency to move in one direction or another. In fact many fortunes have been made when speculators believed a currency should be lower and a group of governments decide the currency should be higher. Often the speculators win this battle. That should show you how liquid this market really is.