Capital Market Equilibrium with Mispricing and Arbitrage Activity
McGill University - Desautels Faculty of Management
London Business School; Centre for Economic Policy Research (CEPR)
Rodney L. White Center for Financial Research Working Paper Series 6-98
This paper develops a general equilibrium, continuous time model where portfolio constraints generate mispricing between redundant securities. Constrained consumption-portfolio optimization techniques are adapted to incorporate redundant, possibly mispriced, securities. We demonstrate the necessity of mispricing for equilibrium when agents are heterogeneous enough. The construction of a representative agent with stochastic weights allows us to characterize prices and allocations, given mispricing occurs, in a general setting. Under logarithmic preferences, we provide explicit conditions for mispricing and closed-form expressions for all economic quantities. Existence of an equilibrium when mispricing occurs with positive probability is verified in a specific case. We demonstrate how mispricing induces agents to engage in riskless arbitrage trades.
JEL Classification: C60, D52, D90, G12working papers series
Date posted: April 29, 1998
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