Abstract: In a three-period finite competitive exchange economy with incomplete financial markets and retrading, we show the generic existence of financial innovation which decreases equilibrium price volatility (as well as innovation which increases it). The existence is obtained under conditions of sufficient market incompleteness. The financial innnovation may consist of an asset which is only traded at time zero, or retraded, and with payoffs only at the terminal date. The existence is shown to be robust in the asset payoff space.
30 pages, October 16, 1999
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