Network centrality statistics.

This table reports the following scenarios: the actual EU ETS (I), No Reassignment (II), Proportional (III), and Random (IV). Data refer to Phase II. The first panel includes both internal and external transactions (Trade specification). The second panel refers to PHAs only. Notice that due to the presence of some registries poorly connected with the rest of the system, centrality measures for some nodes appear higher than those for the others. Source: Authors’ own elaborations.