These global business handoffs allow the foreign exchange market (FOREX-FX) to remain open 24 hours per weekday. However, trading volumes fluctuate and are not equal across all sessions. This map applies data that indicate that Forex trading sessions are vary either 8am to 4pm, or 9am to 5pm local time and anything between. The optimal time to trade the forex (foreign exchange) market is when it's at its most active levels—that's when trading spreads (the differences between bid prices and the ask prices) tend to narrow. In these situations, less money goes to the market makers facilitating currency trades, leaving more money for the traders to pocket personally.