In this paper I investigate the nature of the beliefs which agents must hold (at least implicitly) in order to justify their considering various alternatives, in two distinct settings: the Walrasian model without production (with competitive equilibrium), and the sell-all version of the...

Recent work on general equilibrium models with incomplete financial markets has demonstrated that when assets pay off in units of account, equilibrium prices and allocations are indeterminate. The equilibria in such models are also generically constrained suboptimal. A central planner can...

A great many of the most important developments in modern economics were first revealed in the pages of Econometrica. This selection of readings from that journal is the third in a series and contains its editors' choice of the best articles in the general area of macroeconomics and capital...

This paper explores the role of portfolio constraints in generating multiplicity of equilibrium. We present a simple financial market economy with two goods and two households, households who face constraints on their ability to take unbounded positions in risky stocks. Absent such constraints,...

This is a leisurely introduction, in the vein of a piece in the history of science, to belated publication of my well-known paper on incomplete Markets, Competitive Equilibrium with Incomplete Financial Markets.