Øyvind Thomassen is an Associate Professor at NHH. He received his PhD (DPhil) in Economics from the University of Oxford in 2010. He was a postdoctoral researcher in the Economics Department at KU Leuven. Before joining NHH in 2020, he was an Assistant Professor (2011-2018) and Associate Professor in the Economics Department at Seoul National University. He is a research associate at the Institute for Fiscal Studies. 

In his research, he uses data to understand firm and consumer behaviour, especially in markets with a large number of differentiated products and multiple sellers. He has done work on the supermarket, automobile and construction (cladding bricks) sectors, and on topics such as cross-category pricing, nonlinear pricing / second-degree price discrimination, vertical contracting with upstream and downstream mergers, the effect of environmental tax (exemption), and antitrust market definition with critical loss analysis. His research papers have appeared in the American Economic Review, International Journal of Industrial Organization, and the Journal of Competition Law and Economics.

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