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Volatility, Information, and Noise Trading

  • Jean-Pierre DANTHINE
  • Serge MORESI

We construct a dynamic competitive model with futures markets where price volatility comes from information arrival and noise trading. In this model, we address three issues: What does informational efficiency mean in a multi-period setting? How do information arrival and noise trading interact to generate price volatility? What are the effects of futures trading on volatility and welfare? Without noise trading, we show that a fully revealing equilibrium price is unlikely to exist if information flows are serially correlated. If it exists, futures trading affects the time pattern of volatility, but volatility over time sums up to a constant. Information arrival has ambiguous welfare effects and the desirability of a futures market may be controversial. With noise trading, total volatility over time increases with the noise variance but it is reduced by information arrival. The period volatility may now be reduced by the arrival of information as prices are less responsive to noise trading.

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Paper provided by Université de Lausanne, Faculté des HEC, DEEP in its series Cahiers de Recherches Economiques du Département d'Econométrie et d'Economie politique (DEEP) with number 9015.

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Length: 29 pages
Date of creation: Aug 1990
Date of revision:
Publication status: Published in European Economic Review, vol. 37 (5), 1993, pp. 961-982
Handle: RePEc:lau:crdeep:9015
Contact details of provider: Postal: Université de Lausanne, Faculté des HEC, DEEP, Internef, CH-1015 Lausanne
Phone: ++41 21 692.33.64
Web page: http://www.hec.unil.ch/deep/publications/cahiers/series
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