Recently there has been a growing debate as to whether the empirical properties ofproduction response derived from the multi-product framework are consistent with thebehavioral assumption in the duality theory of production. This issue could in turn affectthe reliable estimates of elasticities...

We derive Lagrange Multiplier and Likelihood Ratio specifi cation tests for the null hypotheses of multivariate normal and Student t innovations using the Generalised Hyperbolic distribution as our alternative hypothesis. We decompose the corresponding Lagrange Multiplier-type tests into...