Basic Principles Of Asset Pricing Theory: Evidence From Large-Scale Experimental Financial Markets

Peter L. Bossaerts () and Charles Plott

No 2578, CEPR Discussion Papers from C.E.P.R. Discussion Papers

Abstract: We report on six large-scale financial markets experiments that were designed to test two of the most basic propositions of modern asset pricing theory, namely, that the interaction between risk averse agents in a competitive market leads to equilibration, and that, in equilibrium, risk premia are solely determined by covariance with aggregate risk. We designed the experiments within the framework suggested by two theoretical models, namely, Arrow and Debreu's complete-markets model, and the Sharpe-Lintner-Mossin Capital Asset Pricing Model (CAPM). This framework enabled us to measure how far our markets were from equilibrium at any point in time, thereby allowing us to gauge the success of the models. The distance measures do not require knowledge of the (uncontrollable) level and dispersion of risk aversion among subjects, and adjust for the impact of progressive trading on the eventual equilibrium. Unlike in our earlier, thin-markets experiments, we discovered swift convergence towards equilibrium prices of Arrow and Debreu's model or the CAPM. This discovery is significant, because subjects always lacked the information to deliberately set asset prices using either model. Sometimes, however, the equilibrium was not found to be robust, with markets readily veering away, apparently as a result of deviations of subjective beliefs from objective probabilities. Still, we find evidence that this did not destroy the tendency for markets to equilibrate as predicted by the theory. In each experiment, we formally test and reject the hypothesis that prices are a random walk, in favour of stochastic convergence towards CAPM and Arrow-Debreu equilibrium.

Keywords: Arrow-Debreu Equilibrium; Asset Pricing; CAPM; Experimental Finance; General Equilibrium (search for similar items in EconPapers)
JEL-codes: D51 G12 (search for similar items in EconPapers)
Date: 2000-10
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Related works:
Working Paper: Basic Principles of Asset Pricing Theory: Evidence From Large-Scale Experimental Financial Markets (2000)
Journal Article: Basic Principles of Asset Pricing Theory: Evidence from Large-Scale Experimental Financial Markets (2004)
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