Speculation and Risk Sharing with New Financial Assets
While the traditional view of financial innovation emphasizes the risk sharing role of new financial assets, belief disagreements about these assets naturally lead to speculation, which represents a powerful economic force in the opposite direction. This paper investigates the effect of financial innovation on portfolio risks in an economy when both the risk sharing and the speculation forces are present. I consider this question in a standard mean-variance framework. Financial assets provide hedging services but they are also subject to speculation because traders do not necessarily agree about their payoffs. I define the average variance of traders' net worths as a measure of portfolio risks for this economy, and I decompose it into two components: the uninsurable variance, defined as the average variance that would obtain if there were no belief disagreements, and the speculative variance, defined as the residual variance that results from speculative trades based on belief disagreements. Financial innovation always decreases the uninsurable variance because new assets increase the possibilities for risk sharing. My main result shows that financial innovation also always increases the speculative variance. This is true even if traders completely agree about the payoffs of new assets. The intuition behind this result is the hedge-more/bet-more effect: Traders use new assets to hedge their bets on existing assets, which in turn enables them to place larger bets and take on greater risks. The net effect of financial innovation on portfolio risks depends on the quantitative strength of its effects on the uninsurable and the speculative variances. I consider a calibration of the model for new assets linked to national incomes of G7 countries, which were recommended by Athanasoulis and Shiller (2001) to facilitate risk sharing. For reasonable levels of belief disagreements, these assets would actually increase the average consumption risks of individuals in G7 countries. In addition, a profit seeking market maker would introduce a different subset of these assets than the ones proposed by Athanasoulis and Shiller (2001). The endogenous set of new assets would be directed towards increasing the opportunities for speculation rather than risk sharing.
|Date of creation:||2012|
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- Duffie Darrell & Rahi Rohit, 1995. "Financial Market Innovation and Security Design: An Introduction," Journal of Economic Theory, Elsevier, vol. 65(1), pages 1-42, February.
- Paul Milgrom & Nancy L.Stokey, 1979.
"Information, Trade, and Common Knowledge,"
377R, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
- John Y. Campbell, 2000.
"Asset Pricing at the Millennium,"
Harvard Institute of Economic Research Working Papers
1897, Harvard - Institute of Economic Research.
- Campbell, John Y. & Viceira, Luis M., 2002. "Strategic Asset Allocation: Portfolio Choice for Long-Term Investors," OUP Catalogue, Oxford University Press, number 9780198296942, December.
- Charles W. Calomiris, 2009. "Financial Innovation, Regulation, and Reform," Cato Journal, Cato Journal, Cato Institute, vol. 29(1), pages 65-91, Winter.
- Stein, Jeremy C., 1987.
"Informational Externalities and Welfare-Reducing Speculation,"
3660740, Harvard University Department of Economics.
- Stein, Jeremy C, 1987. "Informational Externalities and Welfare-Reducing Speculation," Journal of Political Economy, University of Chicago Press, vol. 95(6), pages 1123-1145, December.
- Cuny, Charles J, 1993. "The Role of Liquidity in Futures Market Innovations," Review of Financial Studies, Society for Financial Studies, vol. 6(1), pages 57-78.
- Snehal Banerjee, 2011. "Learning from Prices and the Dispersion in Beliefs," Review of Financial Studies, Society for Financial Studies, vol. 24(9), pages 3025-3068.
- John Geanakoplos, 2009. "The Leverage Cycle," Cowles Foundation Discussion Papers 1715, Cowles Foundation for Research in Economics, Yale University.
- Rubinstein, Mark, 1974. "An aggregation theorem for securities markets," Journal of Financial Economics, Elsevier, vol. 1(3), pages 225-244, September.
- Varian, Hal R, 1985. " Divergence of Opinion in Complete Markets: A Note," Journal of Finance, American Finance Association, vol. 40(1), pages 309-317, March.
- David M. Kreps, 2012. "Microeconomic Foundations I: Choice and Competitive Markets," Economics Books, Princeton University Press, edition 1, number 9890.
- Stiglitz, J.E., 1989. "Using Tax Policy To Curb Speculative Short-Term Trading," Papers t2, Columbia - Center for Futures Markets.
- Hart, Oliver D., 1975. "On the optimality of equilibrium when the market structure is incomplete," Journal of Economic Theory, Elsevier, vol. 11(3), pages 418-443, December.
- Dieckmann, Stephan, 2011. "Rare Event Risk and Heterogeneous Beliefs: The Case of Incomplete Markets," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 46(02), pages 459-488, April.
- Summers, L.H. & Summers, V.P., 1989. "When Financial Markets Work Too Well : A Cautious Case For A Securities Transactions Tax," Papers t12, Columbia - Center for Futures Markets.
- Miller, Merton H., 1986. "Financial Innovation: The Last Twenty Years and the Next," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 21(04), pages 459-471, December.
- 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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