We consider weak preference orderings over a set An of n alternatives. An individual preference is of refinement l <=n if it first partitions An into l subsets of "tied" alternatives, and then ranks these subsets within a linear ordering. When l

How far can we go in weakening the assumptions of the general equilibrium model? Existence of equilibrium, structural stability and finiteness of equilibria of regular economies, genericity of regular economies and an index formula for the equilibria of regular economies have been known not to...