have 50 employees or more face substantially more regulation than firms that have less than 50. The size distribution of … developed with a payroll tax of 0.15% that only applies to firm above 50 employees. Removing the regulation improves labor …

relevance of clustering behaviours in the location of authors working on clusters and in measuring the influence of geographical … distance in co-authorship. We measure the extent of a convergence process of the vocabulary of scientists working on clusters …