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Implementation and Orderings of Public Information

  • Colin Campbell


    (Rutgers University)

We explore the relationship between public information and implementable outcomes in an environment characterized by random endowments and private information. We show that if public signals carry no information about private types, then an exact relationship holds: a more informative public signal structure, in the sense of Blackwell, induces a smaller set of ex-ante implementable social choice functions. This holds for a large set of implementation standards, including Nash implementation, and Bayesian incentive compatibility. The result extends the notion, dating to Hirshleifer (1971), that public information can have negative value to an endowment economy under uncertainty.

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Paper provided by Rutgers University, Department of Economics in its series Departmental Working Papers with number 200303.

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Date of creation: 07 Feb 2003
Date of revision:
Handle: RePEc:rut:rutres:200303
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  1. Green, Jerry R, 1981. "Value of Information with Sequential Futures Markets," Econometrica, Econometric Society, vol. 49(2), pages 335-58, March.
  2. Colin M. Campbell, 2002. "Blackwell's Ordering and Public Information," Departmental Working Papers 200206, Rutgers University, Department of Economics.
  3. Bernhard Eckwert & Itzhak Zilcha, 2003. "Incomplete risk sharing arrangements and the value of information," Economic Theory, Springer, vol. 21(1), pages 43-58, 01.
  4. Marshall, John M, 1974. "Private Incentives and Public Information," American Economic Review, American Economic Association, vol. 64(3), pages 373-90, June.
  5. Edward E. Schlee, 2001. "The Value of Information in Efficient Risk-Sharing Arrangements," American Economic Review, American Economic Association, vol. 91(3), pages 509-524, June.
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