In a recent paper, Bloom et al. (2020) find evidence for a substantial decline in research productivity in the U …

enhancing the assignment of workers to jobs in the face of firm productivity heterogeneity and skill-biased technological change …. It shows that in order to do so policy needs to be a function of the properties of the firm's productivity distribution … emerging from the analysis is that the degree of firm productivity heterogeneity, in terms of skewness and variance, matters …