Is an overbought market reason to sell? The S&P 500 (NYSEARCA:SPY) actually outperforms...

Is an overbought market reason to sell? The S&P 500 (NYSEARCA:SPY) actually outperforms across a range of periods following a move 10% above its 200-day moving average, writes Ryan Detrick. Still he notes, the last 2 times the S&P was this overbought brought nasty corrections - the index nearly 10% lower 6 months later in each instance.