Wholesale level demand for fish grades in Greece

Differential inverse systems are used in this paper to investigate the stru cture of wholesale level demand for fish grades in Greece. Model selection tests suggest that the inverse CBS performs better that the competing diffe rential systems. Homotheticity and separability tests indicate that the und erlying distance function is homothetically separable in the medium- and th e low-value species. The own-quantity flexibilties suggest that the respons e of prices to own-quantity changes are inelastic while the cross-quantity flexibilities indicate that the substitution possibilities among fish grade s are rather limited.