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PurposeThe purpose of this study is to examine whether the elasticity of substitution (ES) varies between developed and developing countries.Design/methodology/approachThe author derives the growth regressions from the Solow model under the constant elasticity of substitution production function by using the first-order Taylor series expansion and estimate them for each country group classified based on time-varying behavior of income per worker using the data-driven algorithm.FindingsThe ES is not unitary and varies among country groups. Developed countries generally have a higher ES than developing countries.Originality/valueFor the first time, the author uses the first-order Taylor series expansion to linearize the steady-state value of income per worker, as the author considers this approach to be relatively more straight-forward and tractable. Furthermore, the author estimates the equations using both cross-section and panel data techniques and employs the data-driven algorithm proposed by Phillips and Sul (2007) to classify countries.

We discuss the sustainability of Chinese high growth relative to growth experience elsewhere, and specifically Soviet Russia in the 1950s to the 1960s by asking if the aggregate technology can eventually similarly constrain high growth performance in the Chinese case as argued by Weitzman in a paper in 1970 discussing the Soviet case. We note in the Chinese case, in contrast to Russia, the declining labor share in GDP over time, which suggests a substitution elasticity above rather than below one. We use time series data on labor's share in GDP to estimate a substitution elasticity for China, finding that the substitution elasticity is greater than one. We then discuss how sub aggregate high growth can occur when there are three sectors, and large outflows of labor occurring from rural to urban areas over time with implications for the role of factor substitution in future Chinese growth. We argue that high growth in China can be supported in such a framework by a rural to urban labor outflows even if the substitution elasticities in both the urban and rural sectors are less than one. We estimate these two production functions using share data and these indicate substitution elasticities less than one. As such we suggest that aggregate substitution elasticities do not necessarily provide a clear guide as to the sustainability of high Chinese growth.