Herrero, C. and A. Villar
Economics Letters – 26.2 (1988) 147-152

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Resumen: In this paper we provide a characterization of those economies exhibiting a non-substitution property. Whilst the assumptions of constant return to scale and a single primary input are necessary, this is not the case for the non-joint production hypothesis. Our characterization lies upon a result which in a sense can be seen as a converse of that in Johansen (1972).