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Dynamic Trading and Asset Prices: Keynes vs. Hayek

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  • Giovanni Cespa
  • Xavier Vives

Abstract

We investigate the dynamics of prices, information and expectations in a competitive, noisy, dynamic asset pricing equilibrium model with long-term investors. We argue that the fact that prices can score worse or better than consensus opinion in predicting the fundamentals is a product of endogenous short-term speculation. For a given, positive level of residual payoff uncertainty, if noise trade displays low persistence rational investors act like market makers, accommodate the order flow, and prices are farther away from fundamentals compared to consensus. This defines a “Keynesian” region; the complementary region is “Hayekian” in that rational investors chase the trend and prices are systematically closer to fundamentals than average expectations. The standard case of no residual uncertainty and noise trading following a random walk is on the frontier of the two regions and identifies the set of deep parameters for which rational investors abide by Keynes’ dictum of concentrating on an asset “long term prospects and those only.” The analysis explains how accommodation and trend chasing strategies differ from momentum and reversal phenomena because of the different information sets that investors and an outside observer have.

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Bibliographic Info

Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number 2839.

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Date of creation: 2009
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Handle: RePEc:ces:ceswps:_2839

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Keywords: efficient market hypothesis; long and short-term trading; average expectations; higher order beliefs; over-reliance on public information; opaqueness; momentum; reversal;

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Cited by:
  1. Albuquerque, Rui & Miao, Jianjun, 2007. "Advance Information and Asset Prices," CEPR Discussion Papers 6588, C.E.P.R. Discussion Papers.
  2. Kristoffer Nimark, 2009. "Speculative dynamics in the term structure of interest rates," Economics Working Papers 1194, Department of Economics and Business, Universitat Pompeu Fabra, revised Sep 2012.
  3. Allen, Franklin & Vayanos, Dimitri & Vives, Xavier, 2014. "Introduction to financial economics," Journal of Economic Theory, Elsevier, vol. 149(C), pages 1-14.
  4. George-Marios Angeletos & Guido Lorenzoni & Alessandro Pavan, 2007. "Wall Street and Silicon Valley: A Delicate Interaction," NBER Working Papers 13475, National Bureau of Economic Research, Inc.

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