How valuable are cognitive and social abilities for entrepreneurs’ incomes as compared to employees? We answer three questions: (1) To what extent does a composite measure of ability affect an entrepreneur's earnings relative to employees? (2) Do different cognitive abilities (e.g. math...

In the period before the second World War, the Dutch Bureau of Statistics had developed two sets of indicators ofunemployment in the Netherlands. One was based on statistical data of unemployment insurance funds of tradeunions and the other one on statistical data of labour exchanges. This paper...