The Informational Content of Prices When Policy Makers React to Financial Markets

42 Pages Posted: 5 Jul 2014 Last revised: 13 Nov 2018

See all articles by Christoph Siemroth

Christoph Siemroth

University of Essex - Department of Economics

Date Written: September 27, 2018


When can policy makers use policy-relevant information from financial market prices and how does policy affect price informativeness? I analyze a novel setting with noise where a policy maker tries to infer information about a state variable from prices to improve policy decisions, and policy in turn affects asset values. I derive a necessary and sufficient condition for the possibility of information revelation in equilibrium, which might not be possible if the policy reaction to prices punishes traders for revealing their information. If the policy maker is uninformed, then policy objectives do not change price informativeness, but they do if the policy maker has independent information about the state. I also analyze policy maker transparency, and find that policy makers with objectives having a large impact on asset values should publish their information before trading to make prices more informative. In other cases, intransparency can be optimal.

Keywords: Asymmetric Information, Central Bank Transparency, Financial Markets, Policy Risk, Price Informativeness, Rational Expectations Equilibrium

JEL Classification: D53, D82, D84, G10

Suggested Citation

Siemroth, Christoph, The Informational Content of Prices When Policy Makers React to Financial Markets (September 27, 2018). Journal of Economic Theory, Forthcoming. Available at SSRN: or

Christoph Siemroth (Contact Author)

University of Essex - Department of Economics ( email )

Wivenhoe Park
Colchester CO4 3SQ
United Kingdom


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