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Regulating Insider Trading when Investment Matters

  • Medrano, Luis Angel
  • Vives, Xavier

We analyse the effects of insider trading on real investment and welfare, and the consequences of different regulatory policies: a disclose-or-abstain rule, ‘fair’ disclosure, laissez-faire and forbidding insider trades based on ‘precise’ information. We perform the analysis in a model in which all traders are rational expected-utility maximizers and aware of their position in the market. We compare the equilibrium with insider trading with the equilibrium in the same market without insider trading in two scenarios: costly and costless information acquisition. We find that with costly information acquisition an abstain-or-disclose rule tends to be optimal while with free information acquisition laissez-faire is better. This suggests enforcing an abstain-or-disclose rule with a high standard of proof for inside information. This rule of thumb advocates a laissez policy both for selective disclosure and in high-tech industries. Our approach uncovers the pitfalls of welfare analysis in the noise trader model.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 3292.

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Date of creation: Apr 2002
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Handle: RePEc:cpr:ceprdp:3292
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  1. Repullo, Rafael, 1999. "Some Remarks on Leland's Model of Insider Trading," Economica, London School of Economics and Political Science, vol. 66(263), pages 359-74, August.
  2. Spiegel, Matthew & Subrahmanyam, Avanidhar, 1992. "Informed Speculation and Hedging in a Noncompetitive Securities Market," Review of Financial Studies, Society for Financial Studies, vol. 5(2), pages 307-29.
  3. Demange, G. & Laroque, G., 1992. "Private Information and the Design of Securities," DELTA Working Papers 92-22, DELTA (Ecole normale supérieure).
  4. Yosha Oved, 1995. "Information Disclosure Costs and the Choice of Financing Source," Journal of Financial Intermediation, Elsevier, vol. 4(1), pages 3-20, January.
  5. Diamond, Douglas W & Dybvig, Philip H, 1983. "Bank Runs, Deposit Insurance, and Liquidity," Journal of Political Economy, University of Chicago Press, vol. 91(3), pages 401-19, June.
  6. Holmstrom, Bengt & Tirole, Jean, 1993. "Market Liquidity and Performance Monitoring," Journal of Political Economy, University of Chicago Press, vol. 101(4), pages 678-709, August.
  7. Danthine, Jean-Pierre & Moresi, Serge, 1993. "Volatility, information and noise trading," European Economic Review, Elsevier, vol. 37(5), pages 961-982, June.
  8. Diamond, Douglas W. & Verrecchia, Robert E., 1981. "Information aggregation in a noisy rational expectations economy," Journal of Financial Economics, Elsevier, vol. 9(3), pages 221-235, September.
  9. Khanna, Naveen & Slezak, Steve L & Bradley, Michael, 1994. "Insider Trading, Outside Search, and Resource Allocation: Why Firms and Society May Disagree on Insider Trading Restrictions," Review of Financial Studies, Society for Financial Studies, vol. 7(3), pages 575-608.
  10. Kyle, Albert S, 1989. "Informed Speculation with Imperfect Competition," Review of Economic Studies, Wiley Blackwell, vol. 56(3), pages 317-55, July.
  11. Demsetz, Harold, 1986. "Corporate Control, Insider Trading, and Rates of Return," American Economic Review, American Economic Association, vol. 76(2), pages 313-16, May.
  12. Rahi, Rohit, 1996. "Adverse Selection and Security Design," Review of Economic Studies, Wiley Blackwell, vol. 63(2), pages 287-300, April.
  13. Utpal Bhattacharya & Hazem Daouk, 2002. "The World Price of Insider Trading," Journal of Finance, American Finance Association, vol. 57(1), pages 75-108, 02.
  14. Bernhardt, Dan & Hollifield, Burton & Hughson, Eric, 1995. "Investment and Insider Trading," Review of Financial Studies, Society for Financial Studies, vol. 8(2), pages 501-43.
  15. Bhattacharya, U. & Spiegel, M., 1989. "Insiders, Outsiders And Market Breakdowns," Papers fb-_89-20, Columbia - Graduate School of Business.
  16. Hayne E. Leland., 1990. "Insider Trading: Should It Be Prohibited?," Research Program in Finance Working Papers RPF-195, University of California at Berkeley.
  17. Sarkar Asani, 1994. "On the Equivalence of Noise Trader and Hedger Models in Market Microstructure," Journal of Financial Intermediation, Elsevier, vol. 3(2), pages 204-212, March.
  18. Dan Bernhardt & Eric Hughson, 1991. "Intraday Trade in Dealership Markets," Working Papers 841, Queen's University, Department of Economics.
  19. Manove, Michael, 1989. "The Harm from Insider Trading and Informed Speculation," The Quarterly Journal of Economics, MIT Press, vol. 104(4), pages 823-45, November.
  20. Bray, Margaret, 1985. "Rational Expectations, Information and Asset Markets: An Introduction," Oxford Economic Papers, Oxford University Press, vol. 37(2), pages 161-95, June.
  21. Damodaran, Aswath & Liu, Crocker H, 1993. "Insider Trading as a Signal of Private Information," Review of Financial Studies, Society for Financial Studies, vol. 6(1), pages 79-119.
  22. Ausubel, Lawrence M, 1990. "Insider Trading in a Rational Expectations Economy," American Economic Review, American Economic Association, vol. 80(5), pages 1022-41, December.
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