Economists have found mixed evidence on what happens when the number of police increases. On the one hand, more law enforcers means higher probability of detecting a crime, which is known as monitoring effect. On the other hand, criminals incorporate this increase into their decision making...

We propose a new estimator for the dynamic panel model, which solves the failure of strict exogeneity by calculating the bias in the first-order conditions as a function of the autoregressive parameter and solving the resulting equation. The estimator does well in a wide variety of situations...

Recent studies emphasize the importance of socio-emotional skills for the success in school as well as for later economic outcomes. However, little is known how practices used by teachers everyday in classrooms impact socio-emotional skills. We show that modern practices such as working in small...