Imperfectly competitive macroeconomic models typically assume a symmetric equilibrium with identical firms, despite the fact that most industries are characterised by substantial degrees of firm heterogeneity. We examine how inter-firm efficiency gaps affect fiscal policy effectiveness under monopolistic competition.

It is well known that some XML elements correspond to objects (in the sense of object-orientation) and others do not. The question we consider in this paper is what benefits we can derive from paying attention to such object semantics, particularly for the problem of keyword queries. Keyword queries against XML data have been studied extensively in recent years, with several lowest-common-ances...

In this paper we will constructively prove the existence of an equilibrium in a competitive economy with sequentially locally non-constant excess demand functions. And we will show that the existence of such an equilibrium in a competitive economy implies Sperner’s lemma. We follow the Bishop style constructive mathematics. Keywords—Sequentially locally non-constant excess demand functions, Equ...