"New administrative data have recently permitted a differentiated and dynamic evaluation of the employment effects of measures of further vocational training in Germany which have been conducted in the context of active labour market policy. The data available for this purpose include firstly...

We explore an hitherto unused approach to testing marginal productivity theory. Our method rests on the simple idea that, under the assumption of a linear homogeneous production function, residual profits are informative about the discrepancies between factor payments and marginal products. Our...

This note presents a general way to decompose differences over time or between objects into the <italic>ceteris paribus</italic> effects and the interaction effects of an arbitrary number of factors. The decomposition addresses the issue of interaction effects between factors which have been neglected in the...

This article revisits the effectiveness of public-sponsored training programs for Germany accounting for dynamic selection into heterogeneous programs. We carefully assess to what extent various aspects of our empirical strategy, such as conditioning flexibly on employment and benefit histories,...

A considerable part of the poverty that is measured in a single period is transitory rather than persistent. In most countries, only a portion of people who are currently poor are persistently poor. People who are persistently poor or who cycle into and out of poverty should be the main focus of...

This paper proposes a comprehensive, path-independent decomposition formula of changes into ceteris paribus effects and interaction effects. The formula implies a reassessment of sequential decomposition methods that are widely used in the literature and that are restrictive in how they treat...