Usually the currency markets have the highest trading activity when occur the overlap of the trading sessions of the two most important financial centers in the world: London and New York. In fact, generally the average range of price movement between 8 am and 12 pm EST time, is on average about 70 percent of the average total range of price movement during the European session and 80 percent of the average total range during the U.S. session. Undoubtedly, for all currency pairs this period is usually the most active and volatile, and for this reason is ideal for traders who want to get high profits in the market with fast price movements, ie traders with high tolerance risk.
By themselves, the above percentages indicate that traders who are interested in trading with highly volatile prices and wide price ranges must act precisely during the hours in which the markets of United States and Europe overlap, especially if they are unable to monitor the market all day.
