Fiscal sustainability in a new Keynesian model

Fiscal sustainability in a new Keynesian model
Document type
Working Paper
Author(s)
Leith, Campbell; Wren-Lewis, Simon
Publisher
Birkbeck, University of London
Date of publication
1 March 2006
Series
Birckbeck World Economy and Finance Research Programme Working Papers
Subject(s)
Trends: economic, social and technology trends affecting business
Collection
Business and management
Material type
Reports

This item is only available to registered users

Register now or Log in

Your use of this content is subject to the terms and conditions of this portal

There has been a wealth of recent work deriving optimal monetary policy utilising New Neo-Classical Synthesis (NNCS) models based on nominal inertia. Such models typically abstract from the impact of monetary policy on the government's finances, by assuming that consumers are infinitely-lived and taxes are lump-sum such that Ricardian Equivalence holds. In this paper, in the context of a sticky-price NNCS model, the authors assume that the government
must adjust spending and/or distortionary taxation to satisfy its intertemporal budget constraint. They then consider optimal monetary and fiscal policies under discretion and commitment in the face of technology, preference and cost-push shocks. They find that the optimal precommitment policy implies a random walk in the steady-state level of debt, generalising earlier results that involved only a single fiscal instrument. In the case of negative fiscal shocks this implies permanently higher taxation and lower output and government spending to support the new steady-state debt stock, but the optimal combination of these variables will ensure a zero rate of inflation under commitment. They also find that the time-inconsistency in the optimal precommitment policy is such that governments are tempted, given inflationary expectations, to raise taxation to reduce the ultimate debt burden they need to service. Since taxation is a distortionary labour income tax, this aggressive raising of taxation raises firms' marginal costs and fuels inflation. The paper shows that this temptation is only eliminated if following shocks, the new steady-state debt is equal to the original, first-best, debt level. This implies that under discretionary policy the random walk result is overturned: debt will always be returned to this initial steady-state even although there is no explicit debt target in the government's objective function. In a series of numerical simulations, the paper shows that the welfare consequences of introducing debt are negligible for precommitment policies, but can be significant for discretionary policy. 

Is this the 'Version of Record (VoR)'?
Many different versions of a publication may be available on the web, only some of which might be considered part of the formal scholarly record. Please check whether this paper has been published in a journal by contacting the author, searching journal databases, or checking CrossMark. It is the responsibility of publishers to register their publications with CrossMark.

Related to Trends: economic, social and technology trends affecting business

UK research and development roadmap

Downloadable report on the UK Research and Development roadmap

UK research and development roadmap summary survey responses

Downloadable document on the UK Research and Development roadmap survey

The post office horizon IT inquiry: call for evidence

Downloadable call for evidence on the Post Office IT Inquiry

Response to the CMA'S market study into online platforms and digital advertising 2020

Downloadable Competition and Markets Authority (CMA) market study into online platforms and digital advertising

More items related to this subject