Many commonly used treatment effects estimators rely on the unconfoundedness assumption ("selection on observables") which is fundamentally non-testable. When evaluating the effects of labor market policies, researchers need to observe variables that affect both treatment participation and labor...

We present a new method for imposing and testing concavity of a cost function using asymptotic least squares, which can easily be implemented even for cost functions which are nonlinear in parameters. We provide an illustration on the basis of a (generalized) Box-Cox cost function with six...

Modern systems of official statistics require the timely estimation of area-specific densities of sub-populations. Ideally estimates should be based on precise geo-coded information, which is not available due to confidentiality constraints. One approach for ensuring confidentiality is by...

Support schemes for unemployed persons aiming to become self-employed have been recently reformed several times. In 2003, the "start-up-subsidy" (Existenzgründungszuschuss) was added to the existing "bridging-allowance" (Überbrückungsgeld) and the two programs to-gether led to a strong...

Turning unemployment into self-employment has become a major focus of German active labour market policy (ALMP) in recent years. If effective, this would not only reduce Germany’s persistently high unemployment rate, but also increase its notoriously low self-employment rate. Empirical...