Yoshiyuki Arata, 13 February 2019

The complex networks formed through customer–supplier relationships between firms have the potential to propagate shocks across the economy. This column explores how bankruptcy is propagated through a network of approximately one million Japanese firms. Bankruptcy propagation is observed empirically, but only very infrequently and with very limited reach. This is because the increased connectivity between firms disperses bankruptcy shocks such that they immediately die out. 

Chih-Sheng Hsieh, Michael König, Xiaodong Liu, Christian Zimmermann, 26 November 2018

Through collaboration networks, researchers create spillovers for one another, and also other researchers indirectly linked to them. This column leverages co-authorship network data for economics to study the impact of these spillovers on total research output. Taking account of spillovers, the results show that the most productive researchers are not those with the most citations. Current funding schemes appear to be ill-designed to take advantage of the spillover effects generated in scientific knowledge production networks. 

Márta Bisztray, Miklós Koren, Adam Szeidl, 18 November 2018

Several recent studies have used network methods to explore the spatial spillovers within cities. This column adds to this literature by exploring how the spatial and managerial networks in Budapest influence firms’ import decisions. A peer in the same building with import experience from a specific country has a strong positive effect on the probability that a firm will start importing from that country. These findings point to the importance of social multipliers in facilitating the diffusion of good business practices. 

Richard Tol, 29 April 2018

The Nobel Memorial Prize in Economic Sciences remains the most prestigious award in the field. This column uses novel data to map the academic genealogy of laureates in economics. Results show that Nobelists are connected, falling into four disjoint graphs, with new winners often being closely related to previous winners. Among a pool of likely candidates for future prizes, more than half trained under a laureate.

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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