This paper develops a model of marital dissolution based on communication difficulties. The quality of a marriage depends on the proximity of an action to a target. The target is unknown, and must be learned over time. Each individual receives private signals about the target, and can...

Various theories have been advanced for why employees leave incumbent firms to found firms in the same industry, which we call spinoffs. We review the accumulating evidence about spinoffs in various high-tech industries, highlighting the central role often played by disagreements. Because...

We construct a model of industry evolution in which the central force for change is the creation and destruction of submarkets. Firms expand when they are able to exploit new opportunities that arrive in the form of submarkets; they contract and ultimately exit when the submarkets in which they...

I report new evidence for localized knowledge spillovers identified by within-patent variations in the geographic matching rates of citations added by inventors and citations added by examiners. Evaluated at the mean citation lag, inventor citations are 20 percent more likely than examiner...

Private information induces individuals to self-select as subjects into clinical research trials, and it induces researchers to select which trials they conduct. We show that selection can induce ex ante therapeutic misconception and ex post disappointment among research subjects; and it...

Jaffe, Trajtenberg and Henderson (Quarterly Journal of Economics, 108(3):577-98, 1993) developed a matching method to study the geography of knowledge spillovers using patent citations, and found that knowledge spillovers are strongly localized. Their method matches each citing patent to a...

This paper produces new estimates of the rate of organizational forgetting in the well-known case study of US wartime ship production. I show that estimation is easily colored by problems of unobserved product heterogeneity and sensitivity to specification of the learning curve. Using data...

We construct a simple model of occupational choice among agents with differing abilities. The fraction of agents creating new businesses who are low ability rises during recessions. Thus, cohorts born during recessions are on average lower quality: their businesses yield lower initial earnings,...

Recent evidence has shown that entrants into self-employment are disproportionately drawn from the tails of the earnings and ability distributions. This observation is explained by a multi-task model of occupational choice in which frictions in the labor market induces mismatches between firms...

Most existing models of employee spinoffs assume they are driven by a desire to implement new ideas. However, history is replete with examples of spinoffs that were launched to continue with old ideas that their parents were in the process of abandoning. We develop a model of technology choice...