Existence and Welfare Properties of Equilibrium in anExchange

In this paper we consider a class of economies with a nite number of divisible commodities, linear production technologies, and indivisible goods, and a nite number of agents. This class contains several well-known economies with indivisible goods and money as special cases. It is shown that if the utility functions are continuous on the divisible commodities and are weakly monotonic both on one of the divisible commodities and on all the indivisible commodities, if each agent initially owns a su cient amount of one of the divisible commodities, and if a \no-production-without-input"-like assumption on production sector holds, then there exists a competitive equilibrium for any economy in this class. The usual convexity assumption is not needed here. Furthermore, by imposing strong monotonicity on one of the divisible commodities we show that any competitive equilibrium is in the core of the economy and therefore the rst theorem of welfare also holds. We further obtain a second welfare theorem stating that under some condtions a Pareto e cient allocation can be sustained by a competitive equilibrium allocation for some well-chosen redistribution of the total initial endowments.