The main cause of financial crisis may be found in the over-optimistic investing of b- ers that leads market prices away from fundamental values. However, in the aftermath of "excess" when stock markets tumble, it is usually the pessimists or short sellers who get publicly blamed. Despite the longstanding controversy on short selling activities, this market instrument remains a widely misunderstood concept by the public while it is an essential tool used by hedge funds for speculation and arbitrage. That is why it is important to investigate short selling for its different motivations and the...