Significance of the Nested Structure in Multiplex World Trade Networks

Figure 6

The four types of degree-degree correlations in nested networks. (a) r (in, in) means in-degree-in-degree correlation; (b) r (in, out) means in-degree-out-degree correlation; (c) r (out, in) means out-degree-in-degree correlation; (d) r (out, out) means out-degree-out-degree correlation.

(a)

(b)

(c)

(d)