新凯恩斯主义粘性信息理论研究评述

A Review of New Keynesian Sticky Information Theory

为了说明价格粘性与工资粘性产生的微观基础,新凯恩斯主义者近年来提出了粘性信息模型,认为关于宏观经济运行的各种信息在经济主体之间的传播是缓慢的,其原因在于获取信息和处理信息是需要花费成本的,最优化也是需要成本的,虽然价格总是变动的,但企业的价格决策并不是总是以当前最新的信息为基础,这就产生了理性的疏忽。新凯恩斯主义者提出了粘性信息的菲利普斯曲线,认为当前通货膨胀率不仅仅取决于当前产出,还依赖于过去对当前通货膨胀率以及产出缺口变动率的预期。本文认为粘性信息理论是凯恩斯主义理论的一次重大飞跃,对微观经济主体的假设更加系统、更接近现实,克服了完全理性假说非现实性的缺点,对经济活动的解释更具有可信度,是当代宏观经济学的重要进展。

To explain the micro-foundation of price and wage stickiness, the New Keynesian economics has advanced the sticky information theory recently. The basic meaning of sticky information is the spread of information about macro economy between economic agents is slow because there is a cost of acquiring, absorbing and processing information, so the economic agents must be rational inattentive. The New Keynesian economics has developed the sticky information Phillips curve to instead of traditional Phillips curve. This model has important significance to theoretical analysis and economic policies. This article will profoundly survey on these advances, and figure that the sticky information model is the important development of new Keynesian economics. The hypothesis of rational inattention is more systematical and realistic than the hypothesis of economic man, its explanation about economic activity become more believable.