We develop a model of matching from firms' perspectives and draw resulting conclusions for the macro-dynamics of an economy. The key insight is that firms may wish to hire workers that are bad matches (having low productivity) in high-demand states, even if the worker must be hired to a long-run...

We investigate risk sharing without commitment by designing an experiment to match a simple model of voluntary insurance between two agents when aggregate income is constant. Participants are matched in pairs. Each period, they receive their income with or without a random component h that one...