Figure 3
Temporal evolution of the reciprocity of the World Trade Web during the 53 years from 1948 to 2000: (a) observed value of r (blue) and its expected values 〈r〉NM under the Weighted Configuration Model (red), the Balanced Configuration Model (green) and the Weighted Random Graph (orange); (b) evolution of ρNM under the same 3 null models as above.
