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Insiders-Outsiders, Transparency and the Value of the Ticker

Giovanni Cespa
  • Function : Author


We consider a multi-period rational expectations model in which risk-averse investors differ in their information on past transaction prices (the ticker). Some investors (insiders) observe prices in real-time whereas other investors (outsiders) observe prices with a delay. As prices are informative about the asset payoff, insiders get a strictly larger expected utility than outsiders. Yet, information acquisition by one investor exerts a negative externality on other investors. Thus, investors' average welfare is maximal when access to price information is rationed. We show that a market for price information can implement the fraction of insiders that maximizes investors' average welfare. This market features a high price to curb excessive acquisition of ticker information. We also show that informational efficiency is greater when the dissemination of ticker information is broader and more timely.


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Dates and versions

hal-00580153 , version 1 (26-03-2011)


  • HAL Id : hal-00580153 , version 1


Thierry Foucault, Giovanni Cespa. Insiders-Outsiders, Transparency and the Value of the Ticker. 2011. ⟨hal-00580153⟩


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