Regression and neural network models of wage determination are constructed where the explanatory variables include detailed information about the impact of school curricula on future earnings. It is established that there are strong non-linearities and interaction effects present in the...

For many parameter vectors, the sustainable configuration of an industry where multiproduct firms have CES cost functions fails to imply the existence of a multiplicity of multiproduct firms. Copyright Blackwell Publishers Ltd and the Board of Trustees of the Bulletin of Economic Research, 2004.