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On the Optimality of Public Signals in the Presence of Private Information.

The Accounting Review 1993 68(1), 93-112
Presents three different models designed to elucidate how the disclosure of public information can enhance the welfare of traders in a financial market when some or all traders also have access to costly private information. Ex ante expected utility; Reversal of the Diamond model; Use of public signals to enhance the welfare of uninformed traders.