In the article under discussion I expressed the wish that the field of elasticities of substitution would be explored more intensively. I very much welcome Dr. Polak's contribution.

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hdl.handle.net/1765/9749
Articles (Jan Tinbergen)
The Review of Economics and Statistics
Erasmus School of Economics

Tinbergen, J. (1950). Note on the Measurement of Elasticity of Substitution in International Trade; a reply to J.J. Polak. The Review of Economics and Statistics. Retrieved from http://hdl.handle.net/1765/9749