Lack of divine coincidence in New Keynesian models

• 成果类型: Article
• 署名作者: Lago Alves, Sergio Afonso
• 署名单位: Central Bank of Brazil
• 刊物名称: JOURNAL OF MONETARY ECONOMICS
• ISSN/ISSBN: 0304-3932
• DOI: 10.1016/j.jmoneco.2014.07.002
• 发表日期: 2014
• 页码: 33-46
• 关键词: Policy trade-off; Divine coincidence; optimal policy; trend inflation

摘要

The literature has long agreed that the divine coincidence holds in standard New Keynesian models: the monetary authority is able to simultaneously stabilize inflation and output gap in response to preference and technology shocks. I show that the divine coincidence holds only when inflation is stabilized at exactly zero. Even small deviations from zero generate policy trade-offs. I demonstrate this result using the model's non-linear equilibrium conditions to avoid biases from log-linearization. When the model is log-linearized, a non-zero steady state level of inflation gives rise to what I call the endogenous trend inflation cost-push shock in the New -Keynesian Phillips curve. (C) 2014 Elsevier B.V. All rights reserved.