Would you expect twins to reach different heights? The comparison is perhaps not so accurate, but in the early 1950s Abruzzo and Sicily were economically very similar. Both were 'full members' of the underdeveloped Mezzogiorno, with little industry, few natural resources, poor transport...

This paper uses the tools of network analysis to assess the different characteristics of world trade in different manufacturing industries.The structure of the trade networks is compared to understand to what extent the world market characteristics differ between sectors. We find that in some...