Sufficient and Necessary Conditions for
Information to Have Social Value in Pure Exchange
Nils H. Hakansson, Gregory Kunkel and James Ohlson
The Journal of Finance, 37, December 1982, 1169-1181.
This paper extends, corrects, and unifies earlier statements concerning the social
value of public information as well as the no-trading conditions in pure exchange.
Sufficient and necessary conditions are provided for both the single-period and two-period
cases in a postsignal trading model. The social value of information is shown to be
closely linked to the allocational efficiency of the market, the degree of homogeneity
of prior beliefs, and of information structures, the time-additivity of preferences,
and the efficiency of endowments. We conclude that the case in favor of public
information is much stronger than previously suggested.
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