You're talking about an individual stock price. I'm talking about the market. Put another way, your strategy completely works because stocks (as a market) tren

You're talking about an individual stock price. I'm talking about the market. Put another way, your strategy completely works because stocks (as a market) trend upward. You'd want to better define "above" and "below" (because, transaction costs) and you'd also want to consider the period (100 days).