Determinacy and Learnability of Monetary Policy Rules in Small Open Economies
在Gali和Monacelli的小型开放经济新凯恩斯模型中，评估不同泰勒型规则如何影响理性预期均衡的确定性和预期稳定性，发现开放度和政策规则类型会改变泰勒原理与均衡可学习性的关系。
This paper evaluates under which conditions different Taylor‐type rules lead to determinacy and expectational stability (E‐stability) of rational expectations equilibrium in a simple “New Keynesian” small open economy model, developed by Gali and Monacelli (2005) . In particular, we extend Bullard and Mitra (2002) results of determinacy and E‐stability in a closed economy to this small open economy framework. Our results highlight an important link between the Taylor principle and both determinacy and learnability of equilibrium in small open economies. More importantly, the degree of openness coupled with the nature of the policy rule adopted by the monetary authorities might change this link in important ways. A key finding is that, contrary to Bullard and Mitra, expectations‐based rules that involve the consumer price inflation and/or the nominal exchange rate limit the region of E‐stability and the Taylor Principle does not guarantee E‐stability. We also show that some forms of managed exchange rate rules can help to alleviate problems of both indeterminacy and expectational instability, yet these rules might not be desirable since they can promote greater volatility in the economy.