Information, trade, and derivative securities

Hellwig's (1980) model is used to analyze the value of improvingtrading opportunities by more frequent trading in the underlyingasset, or by trading in a derivative asset. With multiple tradingsessions, uninformed investors behave as rational trend followers,while more informed investors follow a contrarian strategy.As trading becomes continuous, Pareto efficiency is achieved.With trading in an appropriate derivative security, Pareto efficiencymay be achieved in only a single round of trading. All derivativeclaims are then priced on Black and Scholes (1973) principlesand, in the absence of further supply shocks, no trading willtake place in subsequent trading rounds.