A Simple Model of Speculation- The Welfare Analysis and Some Problems in the Decision Making Theory
This article analyzes the effect of speculation on the economic welfare from various criteria, using a simple Edgeworth box within a three-period Walrasian competition framework. Here “speculation” is defined as a series of transition processes of each agent’s spontaneous production of private information, the exchange of commodities based on it under the externality environment, and finally its spillover into public. The methodology and implications are closely related with the concepts of herd behavior by Banerjee (1992), informational externality by Stein (1987), information sharing by Shapiro (1985), and economic value of speculation by Hirshleifer (1971, 1975, 1977). It is explicitly shown that the complete sharing of produced information under externality environment, if not accompanied by almost sure productivity effect, does not necessarily attain the non-negative economic value especially in terms of ex-ante expected utility. The implication is consistent with Aoki (2005). Lastly some criticisms about why this could happen are discussed.
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- Raaj Kumar Sah & Joseph E. Stiglitz, 1984.
"The Architecture of Economic Systems: Hierarchies and Polyarchies,"
NBER Working Papers
1334, National Bureau of Economic Research, Inc.
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- Hirshleifer, Jack, 1971. "The Private and Social Value of Information and the Reward to Inventive Activity," American Economic Review, American Economic Association, vol. 61(4), pages 561-574, September.
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- J. Michael Harrison & David M. Kreps, 1978. "Speculative Investor Behavior in a Stock Market with Heterogeneous Expectations," The Quarterly Journal of Economics, Oxford University Press, vol. 92(2), pages 323-336.
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