João Amador, Sónia Cabral, 23 December 2016

Global Value Chains have become the paradigm for the international organisation of production in almost all sectors. Bilateral gross trade flows no longer accurately represent interconnections among countries, so new methods of analysis are needed. Using tools of network analysis, this column assesses the roles of goods and services as both inputs and outputs in GVCs between 1995 and 2011 and examines the profile of Germany, the US, China and Russia as suppliers of value added.

Co-Pierre Georg, Michael E. Rose, 16 January 2016

Informal collaboration is an integral part of academia. Studies of academic collaboration have mostly focused on formal collaboration, as measured by co-authorships. This column instead constructs a network of informal collaboration in financial economics, exploiting acknowledgements of assistance appearing in published papers. Three rankings of financial economists are constructed based on acknowledgement occurrence and centrality. Being helpful is not found to predict centrality in the informal collaboration network.

Margherita Comola, Marcel Fafchamps, 08 December 2015

Dyadic social network data – describing relations between two actors – are frequently derived from self-reporting surveys. This column explores how the misreporting problems that are typical of such data can bias estimations. Data on transfers between households in a Tanzanian village are shown to display a high rate of discrepancies within dyads. Failure to account for such misreporting results in a sizeable underestimation of inter-household transfers. 

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