Everyone is a market timer. Some people buy when they have money, and sell when they need money, while others use methods that are more sophisticated.—-Marian McClellan, co-inventor of the McClellan Oscillator and Summation Index
This is a good reminder that any transactions you make are inextricably linked with time. While there is no way to ever know where the exact top or exact bottom is, there are plenty of diffusion indexes that can usefully identify oversold markets that present good buying opportunities. (For one example, see here.) You might as well try to be intelligent about your purchase decisions.
HT: Tom McClellan, Bollinger Markets List
