Policy with Dispersed Information
JOURNAL OF THE EUROPEAN ECONOMIC ASSOCIATION, Vol. , No.1, pp. 11-60, March 2009
47 Pages Posted: 1 Nov 2007 Last revised: 4 Jun 2010
There are 2 versions of this paper
Policy with Dispersed Information
Policy with Dispersed Information
Date Written: March 2009
Abstract
Information regarding economic fundamentals is widely dispersed in society, is only imperfectly aggregated through prices or other indicators of aggregate activity, and can not be centralized by the government or any other institution. In this paper we seek to identify policies that can improve the decentralized use of such dispersed information without requiring the government to observe this information. We show that this can be achieved by appropriately designing the contingency of taxation on ex-post public information regarding the realized fundamentals and aggregate activity. When information is common (as in the Ramsey literature) or when agents have private information only about idiosyncratic shocks (as in the Mirrlees literature), the contingency on fundamentals alone suffices for efficiency. When instead agents have private information about aggregate shocks, the contingency on aggregate activity is crucial. An appropriate combination of the two contingencies permits the government to: (i) dampen the impact of noise and hence reduce non-fundamental volatility, without also dampening the impact of fundamentals; (ii) induce agents to internalize informational externalities, and hence improve the speed of social learning; (iii) restore a certain form of constrained efficiency in the decentralized use of information; (iv) guarantee that welfare increases with the provision of any additional information.
Keywords: Optimal policy, private information, complementarities, information externalities, social learning, efficiency
JEL Classification: C72, D62, D82
Suggested Citation: Suggested Citation
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