Direct separability in multi-output technologies: An application to the Italian agricultural sector
研究了多产出生产函数中直接弱可分性的条件，用弹性形式表达，并应用于意大利农业部门，为检验生产技术结构提供方法。
The hypothesis of direct weak separability of the transformation function places fewer restrictions on production technology than those deriving from alternative multistage procedures based on indirect separability assumptions. We derive an explicit form of the necessary and sufficient conditions for direct weak separability in the multiple output case. These conditions are expressed in elasticity terms so they can be readily maintained or tested in commonly used flexible functional forms. Parametric restrictions are derived for the multi-output translog profit function. The procedure is applied to the Italian agricultural sector. Copyright 1996 by Oxford University Press.