We analyze fundamental characteristics of the inter-firm transaction network through the data of 800,000 Japanese firms. We find that there exists a hierarchical structure and a negative degree correlation in this transaction network. We also find that this undirected network is a scale-free...

This paper considers the empirical assessment of the relationship between prices and number of firms in local markets in geographic or, more generally, characteristic space and its use as evidence in merger cases. It outlines a structural, semi-nonparametric econometric model of competition in...

A trend common to virtually all European banking markets over the last decade or so has been the fall in bank numbers. The decline in number of banks and the associated increase in market concentration may suggest that banking service choice is declining. However, a growth in branch numbers in...