In this paper, we examine an exchange economy with a financial market composed of three assets: shares of a stock, European call options written on the stock, and riskless bonds. The financial market is assumed to be incomplete and the option is not a redundant asset. In such a case the construction of a riskless hedge-portfolio to valuate the option is unfeasible and therefore the pricing of the assets becomes a simultaneous valuation problem, nonlineary depending on the preferences of the agents. First, the case of homogeneous agents (or equivalently of a representative agent) is studied. By means of numerical analysis, it can be found that individual preferences have a major impact on the price relation of the assets, including the price of the option. This stays in contrast to the Black-Scholes analysis, where the option is a redundant asset. A unique price relation exists and no trading takes place. In the case of heterogeneous agents the price relation of the assets crucially depends on the span of the heterogeneity of the preferences. Now, trading takes place. The more risk averse agents buy the bond and sell the share and the option, whereas the less risk averse agents buy the option and the share and sell the riskless bond. More surprisingly we find that the representative asset-pricing-model overprices the riskless bond and underprices the option in relation to our model of heterogeneous agents.
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Paper provided by Universiteit van Amsterdam, Center for Nonlinear Dynamics in Economics and Finance in its series CeNDEF Workshop Papers, January 2001 with number
2A.2.
Length: Date of creation: 04 Jan 2001 Date of revision: Handle: RePEc:ams:cdws01:2a.2
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Find related papers by JEL classification: C60 - Mathematical and Quantitative Methods - - Mathematical Methods and Programming - - - General D52 - Microeconomics - - General Equilibrium and Disequilibrium - - - Incomplete Markets G12 - Financial Economics - - General Financial Markets - - - Asset Pricing
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