IDEAS home Printed from https://ideas.repec.org/p/ces/ceswps/_1295.html
   My bibliography  Save this paper

The Existence of Informationally Efficient Markets When Individuals Are Rational

Author

Listed:
  • Marc-Andreas Muendler

Abstract

A rational-expectations equilibrium with positive demand for financial information does exist under fully revealing asset price - contrary to a wide-held conjecture. Generalizing the common additive signal-return model with CARA utility to the family of distributions with moment generating functions, this paper shows that individual investors endowed with an average portfolio demand information in equilibrium if they can adjust portfolio size. More information diminishes the expected excess return of a risky asset so that investors who only have a choice of portfolio composition or whose asset endowments strongly differ from the average portfolio are worse off. Under fully revealing price, information market equilibria both with and without information acquisition are Pareto efficient.

Suggested Citation

  • Marc-Andreas Muendler, 2004. "The Existence of Informationally Efficient Markets When Individuals Are Rational," CESifo Working Paper Series 1295, CESifo.
    • Handle: RePEc:ces:ceswps:_1295
    as

    Download full text from publisher

    File URL: https://www.cesifo.org/DocDL/cesifo1_wp1295.pdf
    Download Restriction: no
    ---><---

    Other versions of this item:

    References listed on IDEAS

    as
    1. Morris, Stephen & Shin, Hyun Song, 1998. "Unique Equilibrium in a Model of Self-Fulfilling Currency Attacks," American Economic Review, American Economic Association, vol. 88(3), pages 587-597, June.
    2. Gadi Barlevy & Pietro Veronesi, 2000. "Information Acquisition in Financial Markets," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 67(1), pages 79-90.
    3. Grossman, Sanford J & Stiglitz, Joseph E, 1976. "Information and Competitive Price Systems," American Economic Review, American Economic Association, vol. 66(2), pages 246-253, May.
    4. Routledge, Bryan R, 1999. "Adaptive Learning in Financial Markets," The Review of Financial Studies, Society for Financial Studies, vol. 12(5), pages 1165-1202.
    5. Radner, Roy, 1979. "Rational Expectations Equilibrium: Generic Existence and the Information Revealed by Prices," Econometrica, Econometric Society, vol. 47(3), pages 655-678, May.
    6. Jordan, J S, 1983. "On the Efficient Markets Hypothesis," Econometrica, Econometric Society, vol. 51(5), pages 1325-1343, September.
    7. Bhattacharya, Sudipto & Pfleiderer, Paul, 1985. "Delegated portfolio management," Journal of Economic Theory, Elsevier, vol. 36(1), pages 1-25, June.
    8. Admati, Anat R., 1991. "The informational role of prices : A review essay," Journal of Monetary Economics, Elsevier, vol. 28(2), pages 347-361, October.
    9. Citanna, Alessandro & Villanacci, Antonio, 2000. "Existence and regularity of partially revealing rational expectations equilibrium in finite economies," Journal of Mathematical Economics, Elsevier, vol. 34(1), pages 1-26, August.
    10. Alessandro Citanna & Antonio Villanacci, 2000. "Existence and regularity of partially revealing rational expectations equilibrium in finite economies," Post-Print hal-00463207, HAL.
    11. Romer, David, 1993. "Rational Asset-Price Movements without News," American Economic Review, American Economic Association, vol. 83(5), pages 1112-1130, December.
    12. Jackson, Matthew O, 1991. "Equilibrium, Price Formation, and the Value of Private Information," The Review of Financial Studies, Society for Financial Studies, vol. 4(1), pages 1-16.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Muendler, Marc-Andreas, 2005. "Rational Information Choice in Financial Market Equilibrium," University of California at San Diego, Economics Working Paper Series qt5q4764nj, Department of Economics, UC San Diego.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Muendler, Marc-Andreas, 2007. "The possibility of informationally efficient markets," Journal of Economic Theory, Elsevier, vol. 133(1), pages 467-483, March.
    2. Muendler, Marc-Andreas, 2005. "Rational Information Choice in Financial Market Equilibrium," University of California at San Diego, Economics Working Paper Series qt5q4764nj, Department of Economics, UC San Diego.
    3. Ian Gale & Joseph Stiglitz, 1989. "A Simple Proof That Futures Markets are Almost Always Informationally Inefficient," NBER Working Papers 3209, National Bureau of Economic Research, Inc.
    4. Le Van, Cuong & Navrouzoglou, Paulina & Vailakis, Yiannis, 2019. "On endogenous formation of price expectations," Games and Economic Behavior, Elsevier, vol. 115(C), pages 436-458.
    5. Pavan, Alessandro & Vives, Xavier, 2015. "Information, Coordination, and Market Frictions: An Introduction," Journal of Economic Theory, Elsevier, vol. 158(PB), pages 407-426.
    6. Beth Allen & James S. Jordan, 1998. "The existence of rational expectations equilibrium: a retrospective," Staff Report 252, Federal Reserve Bank of Minneapolis.
    7. Pietra, Tito & Siconolfi, Paolo, 2008. "Trade and revelation of information," Journal of Economic Theory, Elsevier, vol. 138(1), pages 132-164, January.
    8. Gao, Feng & Song, Fengming & Wang, Jun, 2013. "Rational expectations equilibrium with uncertain proportion of informed traders," Journal of Financial Markets, Elsevier, vol. 16(3), pages 387-413.
    9. Donati, Paola & Momi, Takeshi, 2003. "Indeterminacy of rational expectations equilibria in sequential financial markets," Journal of Mathematical Economics, Elsevier, vol. 39(7), pages 743-762, September.
    10. Siemroth, Christoph, 2014. "Why prediction markets work : The role of information acquisition and endogenous weighting," Working Papers 14-02, University of Mannheim, Department of Economics.
    11. Feess, Eberhard & Wohlschlegel, Ansgar, 2006. "Liability and information transmission: The advantage of negligence based rules," Economics Letters, Elsevier, vol. 92(1), pages 63-67, July.
    12. Berliant, Marcus & Yu, Chia-Ming, 2013. "Rational expectations in urban economics," Regional Science and Urban Economics, Elsevier, vol. 43(2), pages 197-208.
    13. Jose M. Marin & Jacques P. Olivier, 2008. "The Dog That Did Not Bark: Insider Trading and Crashes," Journal of Finance, American Finance Association, vol. 63(5), pages 2429-2476, October.
    14. Muendler, Marc-Andreas, 2008. "Risk-neutral investors do not acquire information," Finance Research Letters, Elsevier, vol. 5(3), pages 156-161, September.
    15. Challe, Edouard & Chrétien, Edouard, 2015. "Market composition and price informativeness in a large market with endogenous order types," Journal of Economic Theory, Elsevier, vol. 158(PB), pages 679-696.
    16. Biais, Bruno & Foucault, Thierry, 1993. "Asymétrie d’information et marchés financiers : une synthèse de la littérature récente," L'Actualité Economique, Société Canadienne de Science Economique, vol. 69(1), pages 8-44, mars.
    17. Raphael A. Auer & Cyril Monnet & Hyun Song Shin, 2021. "Distributed Ledgers and the Governance of Money," CESifo Working Paper Series 9441, CESifo.
    18. Challe, Edouard & Chrétien, Edouard, 2018. "Market microstructure, information aggregation and equilibrium uniqueness in a global game," European Economic Review, Elsevier, vol. 102(C), pages 82-99.
    19. Li, Jinfang, 2022. "The sentiment pricing dynamics with short-term and long-term learning," The North American Journal of Economics and Finance, Elsevier, vol. 63(C).
    20. Chen, Xingjiang & Ruan, Xinfeng & Zhang, Wenjun, 2021. "Dynamic portfolio choice and information trading with recursive utility," Economic Modelling, Elsevier, vol. 98(C), pages 154-167.

    More about this item

    Keywords

    information; efficiency; financial markets; portfolio theory;
    All these keywords.

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

    NEP fields

    This paper has been announced in the following NEP Reports:

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:ces:ceswps:_1295. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Klaus Wohlrabe (email available below). General contact details of provider: https://edirc.repec.org/data/cesifde.html .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.