Users of the social networking service Facebook have the possibility to post status updates for their friends to read. In turn, friends may react to these short messages by writing comments or by pressing a Like button to show their appreciation. Making use of five Swedish accounts, we set up a...

Using cultural transmission, we develop a model that gives some microfoundation to the impact of residential neighborhood on children's educational attainment and then test it using the UK National Child Development Study. We find that, for high-educated parents, the better the quality of the...

This paper analyzes peer effects among university scientists. Specifically, it investigates whether the number of peers and their average quality affects the productivity of researchers in physics, chemistry, and mathematics. The usual endogeneity problems related to estimating peer effects are...

Many firms encourage employees to own company stock through share plans that subsidizethe price at favorable rates, but even so many employees do not buy shares. Using a newsurvey of employees in a multinational with a share ownership plan, we find considerablevariation in joining among...

This paper presents a simple model of strategic network formation with local complementarities in effort levels and positive local externalities for a general class of payoff functions. Results are obtained for one-sided and two-sided link creation. In both cases (pairwise) Nash equilibrium...

We test whether people’s tendency to stick with the default option can help save resources. In a natural field experiment we switch printers’ default settings, from simplex to duplex printing, at a large Swedish university. The results confirm that roughly one third of all printing is...

No behavior sits in a vacuum, and one behavior can greatly affect what happens next. We propose a conceptual frame within which a broad range of behavioral spillovers can be accounted for when applying behavioral science to policy challenges. We consider behaviors which take place sequentially...

We conduct a controlled lab-field experiment to directly test the short-run spillover effects of one-off financial incentives in health. We consider how incentives affect effort in a physical activity task – and then how they spillover to subsequent eating behaviour. Compared to a control...

Per capita incomes across European regions are not equal and do not stay constant; regional income distributions uctuate over time. Such a process could have many possible limiting outcomes: complete equal- ity (convergence), stratication, and continually increasing inequality are but three...

This paper uses a model of growth and imperfect capital mobility across multiple economies to characterize the dynamics of (cross-country) in- come distributions. This allows convenient study of the convergence hypothesis, and reveals, where appropriate, polarization and clumping within...