Figure 5
From: K-core robustness in ecological and financial networks
K-shell population of financial networks by economic sector. (a) shows the Gini coefficient G of each network’s maximum core \({k}_{core}^{max}\). Note the drastic shift from average G of 0.51 before 1992 to a much higher average G of 0.87 afterwards. This agrees with the shift from a core occupied by a variety of industries to one occupied by only one or two. (b) Shows the composition of the maximum core for each network. The sudden transition to domination by one or two sectors could stem from the advent of online trading in the early 1990s allowing for anyone, anywhere to be involved in the stock market, or of financial deregulation in the 1990s. (c) shows the composition of the outermost (k = 1) shell of the financial networks, which stays more or less constant.
