Given the production technology of a multiproduct firm, economists usually try to represent this technology by functions, namely the cost function, the revenue function and the input and output distance functions. In doing so the analysis directs the attention to the (dual)matching of quantities...

Our contribution offers a methodological exhibition of general equilibrium models with price and quantity signals. By the application of optimal value functions the household as well as the firm behaviour is modelled. The concepts of virtual prices and virtual quantities allow us to express...