We reconsider the allocational invariance of equilibria to different formulations of market completeness. We identify the so-far neglected assumption of sophisticated behavior as crucial to this result. The paper studies three market structures. First, the Arrow-Debreu setting is considered....

We discover that letting agents pairwise sequentially exchange at "wrong" prices has a robust effect on prices at convergence. If the initial relative price for a good is cheaper than the equilibrium walrasian price due to initial endowments, the initial excess demand effect pushes resource...

We include initial holdings in the jungle economy of Piccione and Rubinstein (Economic Journal, 2007) and relax the assumptions on consumption sets and preferences. We show that initial holdings are irrelevant for lexicographic welfare maximization. Equilibria other than such maximizers can be...

While most may believe that we have a good understanding of the linear sharing mechanism, we show that we may not. In a standard exchange economy with heterogeneous beliefs, we derive necessary and sufficient conditions for Pareto efficient linear sharing rules and present the unknown and...

We consider competitive markets for multiple commodities with endogenous formation of one- or two-person households. Within each two-person household, externalities from the partner's commodity consumption and unpriced actions are allowed. Each individual has two types of traits: observable...

The introduction and widespread use of credit cards increases trading efficiency but, by also increasing the velocity of money, it causes inflation, in the absence of monetary intervention. If the monetary authority attempts to restore pre-credit card price levels by reducing the money supply,...

Double auctions with profit-motivated human traders as well as quot;zero-intelligencequot; programmed traders have previously been shown to converge to Pareto optimal allocations in partial equilibrium settings. We show that these results remain robust in two-good general equilibrium settings...

We consider trade liberalization in a multilateral trade model, where countries have identical homothetic tastes but may have different constant returns to scale technologies that produce at least two goods from at least two factors. In this model, we derive the world prices after trade...

In classical models of markets, the state of nature is revealed regardless of the actions agents take. If instead agents can uncover information they will determine which states can be distinguished and thus which goods are traded. Competitive equilibria can then be inefficient. One source of...