This article has six chapters: chapter one includes the background and study condition of ERP as well as the main contents and structure of this article.

全文共分为六章：第一章阐述了研究ERP的背景意义、研究现状、论文的主要内容和结构。

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Edmund Phelps, who came second with six of 60 entries in a pool of economists run by the author of this article, has made many important contributions to micro- and macroeconomics.

ECONOMIST: Nobel prize in economics