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IntroductionThis paper provides a review of the theory of the determinants of individual and national thrift that has come to be known as the Life Cycle Hypothesis (LCH) of saving. Applications to some current policy issues are also discussed.Part I deals with the state of the art on the eve of the formulation of the LCH some 30 years ago. Part II sets forth the theoretical foundations of the model in its original formulation and later amendment, calling attention to various implications, distinctive to it and, sometimes, counter-intuitive. It also includes a review of a number of crucial empirical tests, both at the individual and the aggregate level. Part III reviews some applications of LCH to current policy issues, though only in sketchy fashion, as space constraints prevent fuller discussion.

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The purpose of this paper is to review what economists know at present about the following question: How large a portion of the existing wealth is the result of a bequest motive, that is, of accumulation for the specific purpose of leaving bequests? But first I will clarify why an answer to this question is of interest.

China's per capita income ranks below 100th in the world. Its saving rate, however, has been one of the highest worldwide in recent decades. In this paper, we attempt to explain the seeming paradox within the framework of the Life-Cycle Hypothesis developed by Franco Modigliani. The key LCH variables are income and population growth. Our results based on data we put together from official sources show that income growth has been the dominant factor behind the dramatic increase in China's saving rate, as predicted by the LCH. Demographic structure and inflation also had significant impact on the fluctuations of the saving rate.