Using a large representative German data set and various concepts of self-employment, this paper tests the “jack-of-all-trades” view of entrepreneurship by Lazear (Am Econ Rev 94(2): 208–211, <CitationRef CitationID="CR27">2004</CitationRef>). Consistent with its theoretical assumptions we find that self-employed individuals perform...</citationref>

Using a large panel data set it is investigated whether works councils act as sand or grease in the operation of German firms. Stochastic production frontier analysis indicates that establishments with and without a works council do not exhibit significant differences in efficiency.