I develop a Markov model of samrt money chasing past winning funds while taking into account associated costs. The model also allows market capital entry and exit. The steady-state capital allocations re derived using constant transition probabilities. The results sugget that down side risk is significantly attributed to investor overreactoin, even though a small degree of investment movement as opposed to capital immobility can in fact stabilize the market. Furthermore, performance sensitivity makes it possible that two much-debated fund styles, passive indexing and active management, are simultaneously profitable. If money is insensitive, the model becomes a zero-sum game where one strategy's profitability is always at the cost of the other