Relaxing the concavity assumption to quasi-concavity in the classical programming problem strengthens the Theory of the Consumer but is said to weaken that of the firm. This paper combines the Euler equation and the concept of sub-manifolds to show that there may be stable, multiple or unique...

The critical role of free entry to correct inherent deviance behavior has been stressed by Vanek (1970), Meade (1972) amongst others. The equivalence theorem (Dreze 1976) defines that labour and entrepreneurial management both lead to the same Pareto optimal equilibrium provided that there is...