For every share of a stock bought, there is a share sold. Typically, this buying and selling is done at an exchange. The combined effect of all this buying and selling is that all available information is quickly incorporated into a stock’s price. So, trying to time the market based on an article you read, a TV show you watched, a chart you analyzed, or what your neighbor said is likely to send you chasing after old news. If only we could stay ahead of old news.
But what about professional stock pickers? They’re professionals, so they must know more than us, or be correct more often, right? Unfortunately, that’s not the case. Check out the this article from DFA to learn why.