动态总需求-总供给模型的介评

Introduction and Evaluation on Dynamic Model of Aggregate Demand and Aggregate Supply

DAD-DAS模型是由美国经济学家曼昆提出来的,它反映的是通货膨胀与产量缺口之间的联系。该模型含有预期、货币政策规则、产量缺口、通货膨胀目标和随机冲击等因素,说明的经济波动方式和机理与传统的AD-AS模型不同。货币政策在短期内有效,长期无效,古典二分法成立,并且存在着产量易变性和通货膨胀易变性的交替。中央银行在实施货币政策时,必须按照泰勒原则抉择才能更好地稳定通货膨胀。本文首先对模型作了简要的介绍,然后重点对其优点和缺点进行了评价。

DAD-DAS model is put forward by American economist N.Gregory Mankiw.The model reflects the relationship between inflation and output gap.It comprises expectation,monetary policy rule,output gap,inflation targeting and random shock et al.The ways and mechanisms of economic fluctuation it clarifies differ from traditional AD-AS model.Monetary policy is effective in the short run and is not effective in the long run.The Classical Dichotomy holds.There is a trade-off of output variability and inflation variability.In order to stabilize inflation better,the central bank must make decision and conduct monetary policy according to Taylor＇s rule.The article makes a concise introduction to the model at first and then put an emphasis on assessments of the model＇s advantages and disadvantages.