IDEAS home Printed from https://ideas.repec.org/p/pra/mprapa/6374.html

Stock Price Manipulation: The Role of Intermediaries

Author

Listed:
  • Siddiqi, Hammad

Abstract

We model stock price manipulation when the manipulator is in the role of an intermediary (broker). We find that in the absence of superior information, the broker can manipulate equilibrium outcomes without losing credibility with respect to accurate forecasting. This result extends to the case when the broker prefers more investment to come into the market. However, when competition among brokers is introduced then the investors get their favorite outcome in the absence of superior information. This result has important implications for encouraging broker competitions in developing markets. Many developing markets are still not demutualized; hence broker level competition is limited in such markets.

Suggested Citation

  • Siddiqi, Hammad, 2007. "Stock Price Manipulation: The Role of Intermediaries," MPRA Paper 6374, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:6374
    as

    Download full text from publisher

    File URL: https://mpra.ub.uni-muenchen.de/6374/1/MPRA_paper_6374.pdf
    File Function: original version
    Download Restriction: no
    ---><---

    Other versions of this item:

    References listed on IDEAS

    as
    1. Marco Battaglini, 2002. "Multiple Referrals and Multidimensional Cheap Talk," Econometrica, Econometric Society, vol. 70(4), pages 1379-1401, July.
    2. van Damme, Eric, 1989. "Stable equilibria and forward induction," Journal of Economic Theory, Elsevier, vol. 48(2), pages 476-496, August.
    3. Jung, Hanjoon Michael, 2007. "Strategic Information Transmission through the Media," MPRA Paper 5556, University Library of Munich, Germany, revised Oct 2007.
    4. Farrell, Joseph & Gibbons, Robert, 1989. "Cheap Talk with Two Audiences," American Economic Review, American Economic Association, vol. 79(5), pages 1214-1223, December.
    5. Manelli, Alejandro M., 1997. "The Never-a-Weak-Best-Response Test in Infinite Signaling Games," Journal of Economic Theory, Elsevier, vol. 74(1), pages 152-173, May.
    6. Khwaja, Asim Ijaz & Mian, Atif, 2005. "Unchecked intermediaries: Price manipulation in an emerging stock market," Journal of Financial Economics, Elsevier, vol. 78(1), pages 203-241, October.
    7. Robert A. Jarrow, 2008. "Market Manipulation, Bubbles, Corners, and Short Squeezes," World Scientific Book Chapters, in: Financial Derivatives Pricing Selected Works of Robert Jarrow, chapter 6, pages 105-130, World Scientific Publishing Co. Pte. Ltd..
    8. repec:fth:stanho:e-89-7 is not listed on IDEAS
    9. Farrell Joseph, 1993. "Meaning and Credibility in Cheap-Talk Games," Games and Economic Behavior, Elsevier, vol. 5(4), pages 514-531, October.
    10. Robert J. Aumann & Sergiu Hart, 2003. "Long Cheap Talk," Econometrica, Econometric Society, vol. 71(6), pages 1619-1660, November.
      • Robert J. Aumann & Sergiu Hart, 2002. "Long Cheap Talk," Discussion Paper Series dp284, The Federmann Center for the Study of Rationality, the Hebrew University, Jerusalem, revised Nov 2002.
    11. Allen, Franklin & Gale, Douglas, 1992. "Stock-Price Manipulation," The Review of Financial Studies, Society for Financial Studies, vol. 5(3), pages 503-529.
    12. Farrell, Joseph & Gibbons, Robert, 1989. "Cheap talk can matter in bargaining," Journal of Economic Theory, Elsevier, vol. 48(1), pages 221-237, June.
    13. In-Koo Cho & David M. Kreps, 1987. "Signaling Games and Stable Equilibria," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 102(2), pages 179-221.
    14. Stein, Jeremy C, 1989. "Cheap Talk and the Fed: A Theory of Imprecise Policy Announcements," American Economic Review, American Economic Association, vol. 79(1), pages 32-42, March.
    15. Rajesh K. Aggarwal & Guojun Wu, 2006. "Stock Market Manipulations," The Journal of Business, University of Chicago Press, vol. 79(4), pages 1915-1954, July.
    16. Banks, Jeffrey S & Sobel, Joel, 1987. "Equilibrium Selection in Signaling Games," Econometrica, Econometric Society, vol. 55(3), pages 647-661, May.
    17. Sudipto Bhattacharya, 1979. "Imperfect Information, Dividend Policy, and "The Bird in the Hand" Fallacy," Bell Journal of Economics, The RAND Corporation, vol. 10(1), pages 259-270, Spring.
    18. Baliga, Sandeep & Morris, Stephen, 2002. "Co-ordination, Spillovers, and Cheap Talk," Journal of Economic Theory, Elsevier, vol. 105(2), pages 450-468, August.
    19. Michael Spence, 1973. "Job Market Signaling," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 87(3), pages 355-374.
    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. Murugesan Punniyamoorthy & Jose Joy Thoppan, 2013. "ANN‐GA based model for stock market surveillance," Journal of Financial Crime, Emerald Group Publishing Limited, vol. 20(1), pages 52-66, January.
    2. Tariq, Yasir Bin & Abbas, Zaheer, 2013. "Compliance and multidimensional firm performance: Evaluating the efficacy of rule-based code of corporate governance," Economic Modelling, Elsevier, vol. 35(C), pages 565-575.
    3. Jung, Hanjoon Michael, 2008. "Paradox of Credibility," MPRA Paper 7443, University Library of Munich, Germany.

    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. Jung, Hanjoon Michael, 2007. "Strategic Information Transmission through the Media," MPRA Paper 5556, University Library of Munich, Germany, revised Oct 2007.
    2. Peter Eso & James Schummer, 2005. "Robust Deviations from Signaling Equilibria," Discussion Papers 1406, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
    3. Dominiak, Adam & Lee, Dongwoo, 2023. "Testing rational hypotheses in signaling games," European Economic Review, Elsevier, vol. 160(C).
    4. Ricardo Alonso & Wouter Dessein & Niko Matouschek, 2008. "When Does Coordination Require Centralization?," American Economic Review, American Economic Association, vol. 98(1), pages 145-179, March.
    5. Dilmé, Francesc, 2025. "Iterated exclusion of implausible types in signaling games," Games and Economic Behavior, Elsevier, vol. 152(C), pages 293-312.
    6. Ke Liu & Kin Lai & Jerome Yen & Qing Zhu, 2015. "A Model of Stock Manipulation Ramping Tricks," Computational Economics, Springer;Society for Computational Economics, vol. 45(1), pages 135-150, January.
    7. Enrique Mart'inez-Miranda & Peter McBurney & Matthew J. Howard, 2015. "Learning Unfair Trading: a Market Manipulation Analysis From the Reinforcement Learning Perspective," Papers 1511.00740, arXiv.org.
    8. Vaccari, Federico, 2023. "Competition in costly talk," Journal of Economic Theory, Elsevier, vol. 213(C).
    9. Hedlund, Jonas, 2017. "Bayesian persuasion by a privately informed sender," Journal of Economic Theory, Elsevier, vol. 167(C), pages 229-268.
    10. Vaccari, Federico, "undated". "Competition in Signaling," FEEM Working Papers 329582, Fondazione Eni Enrico Mattei (FEEM).
    11. Dosis, Anastasios, 2018. "On signalling and screening in markets with asymmetric information," Journal of Mathematical Economics, Elsevier, vol. 75(C), pages 140-149.
    12. Bernheim, B. Douglas & Bodoh-Creed, Aaron L., 2023. "Pervasive signaling," Theoretical Economics, Econometric Society, vol. 18(1), January.
    13. Venkatesh, Raghul S, 2017. "Cheap Talk with Strategic Substitutability," CRETA Online Discussion Paper Series 31, Centre for Research in Economic Theory and its Applications CRETA.
    14. Chen, Ying & Oliver, Atara, 2023. "When to ask for an update: Timing in strategic communication," Journal of Economic Theory, Elsevier, vol. 211(C).
    15. Starkov, Egor, 2023. "Only time will tell: Credible dynamic signaling," Journal of Mathematical Economics, Elsevier, vol. 109(C).
    16. Jorge M. Streb, 2018. "Credible signals: A refinement of perfect Bayesian equilibria," CEMA Working Papers: Serie Documentos de Trabajo. 674, Universidad del CEMA.
    17. Péter Eső & James Schummer, 2009. "Credible deviations from signaling equilibria," International Journal of Game Theory, Springer;Game Theory Society, vol. 38(3), pages 411-430, November.
    18. Austen-Smith, David & Banks, Jeffrey S., 2000. "Cheap Talk and Burned Money," Journal of Economic Theory, Elsevier, vol. 91(1), pages 1-16, March.
    19. Kadıoğlu, Eyüp & Frömmel, Michael, 2022. "Manipulation in the bond market and the role of investment funds: Evidence from an emerging market," International Review of Financial Analysis, Elsevier, vol. 79(C).
    20. Azad, A.S.M. Sohel & Azmat, Saad & Fang, Victor & Edirisuriya, Piyadasa, 2014. "Unchecked manipulations, price–volume relationship and market efficiency: Evidence from emerging markets," Research in International Business and Finance, Elsevier, vol. 30(C), pages 51-71.

    More about this item

    Keywords

    ;
    ;
    ;
    ;
    ;
    ;

    JEL classification:

    • G1 - Financial Economics - - General Financial Markets
    • G2 - Financial Economics - - Financial Institutions and Services
    • G3 - Financial Economics - - Corporate Finance and Governance

    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:pra:mprapa:6374. 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: Joachim Winter (email available below). General contact details of provider: https://edirc.repec.org/data/vfmunde.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.