The goal of this article is to provide a general characterization of the aggregate behavior of a group in a market environment. We allow for public and private consumption, intragroup production, and consumption externalities within a group; we only assume that the group always reaches...

We characterize the equilibrium manifold of an economy when initial endowments can be individually observed. We adopt a local, "differentiable" perspective. We derive necessary and sufficient conditions that characterize the equilibrium manifold, and we show that, if these conditions are...

We present identification and estimation results for the “collective” model of labour supply in which there are discrete choices, censoring of hours and nonparticipation in employment. We derive the collective restrictions on labour supply functions and contrast them with restrictions...