Currency traders make decisions using both technical factors and economic fundamentals. Technical traders use charts, trend lines, support and resistance levels, and numerous patterns and mathematical analysis to identify trading opportunities, whereas fundamentalists predict price movements by interpreting a wide variety of economic information, including news, government-issued indicators and reports, and even rumors. The most dramatic price movements, however, occur when unexpected events happen. The event can range from a Central Bank raising domestic interest rates to the outcome of a political election or even an act of war. Nonetheless, more often it is the expectation of an event that drives the market rather than the event itself.