In the U.S., large firms now account for a greater share of economic activity, new are being created at slower rates, and workers receiving smaller GDP. Changes in population growth provide unified quantitative explanation. A decrease lowers firm entry shifting firm‐age distribution toward older firms. Firm aging accounts (i) concentration employment firms, (ii) trends average size exit key det...

Particulate pollution is closely related to public health. PM1 (particles with an aerodynamic size not larger than 1 μm) much more harmful particles sizes because it goes deeper into the body and hence arouses social concern. However, sparse unevenly distributed ground-based observations limit understanding of spatio-temporal distributions in China. In this study, hourly concentrations central ...

Abstract In the article a new approach for measuring spatial concentration of human population is presented and tested. The procedure based on concept introduced by Gini and, at same time, its extension (i.e., taking into account autocorrelation, polarization). proposed indicator, Spatial Index, then computed using two different kind territorial partitioning methods: MaxMin (MM) Constant Step (...