A NOTE ON MEASURING SECTORAL INPUT PRODUCTIVITY*

This note attempts to shed some light on the relationship between the total factor productivity derived from national income accounts and the total input productivity based upon input-output accounts, especially on a sectoral basis. Since there has been no positive evidence to support a constancy between changes in net and gross output in individual industries, the formulation of a measure of sectoral input productivity change by using the formula of the Divisia index based on input-output accounts may be valuable in examining possible biases which are associated with a common notion of the total factor productivity. An operational definition of sectoral input productivity change and its relation to sectoral total factor productivity are discussed in the present note, in addition to its empirical application to the Japanese data.     

经济结构变化与经济增长

卡尔多事实描述的是发达工业化经济在短期内的现象,如果我们考虑欠发达国家,或者考虑工业化早期,卡尔多事实所反映的规律就会消失。一般而言,人均产出增长率与人均产出水平两者之间表现出非线性的驼峰形(hump-shaped)关系。本文认为,这种关系是由于经济内部结构的变化(即农业、制造业和服务业的相对比重变化)以及城乡劳动力转移和城市化引起的。进一步,本文提出了两种相互竞争的模型,一种认为经济增长由工业部门驱动,另一种则认为城市化是经济增长的动力。两种模型都与经济结构变化和经济增长的主要特征吻合,至于哪一个模型能更好地反映经济现实,则还需要进一步验证。     

经济结构变化与经济增长

卡尔多事实描述的是发达工业化经济在短期内的现象,如果我们考虑欠发达国家,或者考虑工业化早期,卡尔多事实所反映的规律就会消失.一般而言,人均产出增长率与人均产出水平两者之间表现出非线性的驼峰形(hump-shaped)关系.该文认为,这种关系是由于经济内部结构的变化(即农业、制造业和服务业的相对比重变化)以及城乡劳动力转移和城市化引起的.进一步,该文提出了两种相互竞争的模型,一种认为经济增长由工业部门驱动,另一种则认为城市化是经济增长的动力.两种模型都与经济结构变化和经济增长的主要特征吻合,至于哪一个模型能更好地反映经济现实,则还需要进一步验证.     

A NOTE ON ADVERSE SELECTION

A model of a labour market in which workers cannot signal their productivity is set up. The nature of adverse selection (too few good trades, too many bad trades, neither or both) is found to depend on the pattern of reservation wages.