Discover and read the best of Twitter Threads about #KlausGugler
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Is #concentration rising? @AffeldtPauline, @JoannaPiechucka, #KlausGugler and I use a novel dataset containing information on over 20,000 relevant antitrust markets between 1990-2014 to assess this question: cepr.org/active/publica…. We find quite some heterogeneity. A thread 1/N 
The extant literature measures #concentration using #industry classifications. Data are mostly aggregated at the national/regional level for all products. Yet, both the #geographic and the #product market definitions should be based on the #substitutability among products. 2/N
Our database identifies over 20,000 product/geographic #antitrust markets affected by over 2,000 mergers scrutinized by the European Commission between 1995-2014. This allows measuring concentration consistently on an economy-wide basis over time (diw.de/documents/publ…) 3/N
