Credibility and Time Inconsistency in a Stochastic World
This paper re-examines the issue of the credibility and sustainability of optimal policies derived from Pontryagin's Maximum Principle and generally regarded as time-inconsistent, in models with forward-looking rational expectations. Specifically, it considers the behaviour of such models in the presence of continuing stochastic noise. This is shown to convert the policy problem from a one-shot dynamic policy game to a continuing game, giving governments an incentive to invest in a reputation for not reneging on the full optimal rule. This incentive may, in certain circumstances, render the full optimal rule credible and therefore sustainable. It is demonstrated that a sufficiently low degree of discounting on the part of government, or a sufficiently high variance of shocks (measured relative to the initial displacement) ensures the sustainability of the full optimal rule. Using a simple dynamic open economy model, these conditions are shown to be plausible unless the discount rate is very high.
If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.
|Date of creation:||Feb 1986|
|Contact details of provider:|| Postal: Centre for Economic Policy Research, 77 Bastwick Street, London EC1V 3PZ.|
Phone: 44 - 20 - 7183 8801
Fax: 44 - 20 - 7183 8820
|Order Information:|| Email: |