Current Projects and Working Papers
When Retail Mergers benefit Producers, Processors, and Consumers: Empirical Evidence from German Retailing [slides]
Selected for presentation in opening plenary session at the 17th CRESSE conference 2023 in Ixia, Rodos
Invited for presentation at DG comp in Spring/Summer 2024
Increasing concentration (e.g., through merger activity) is one of the major policy concerns of our times. Retail mergers are different than other mergers because larger retailers can (i) distribute the share of costs over more units (fixed cost degression) and (ii) demand lower input prices when buying more items (buyer power). Our paper analyzes the effects of a merger between a German supermarket chain and a soft discounter on retail prices, retail costs, and buyer power. Using data from two complementary grocery retailing categories, we disentangle three post-merger effects: market power, efficiency gains in distribution, and buyer power increase vis-a-vis the suppliers (i.e., the ability to negotiate lower input prices). We find that retailers decrease prices while being able to increase markups, which is caused by cost savings from fixed cost degression and increased buyer power. Although suppliers get lower prices, they benefit nonetheless by selling more units at a lower price, which we explain with reduced double-markup inefficiencies.
Preliminary Work in Progress
State Aid, Productivity, and Competition, joint with Sven Heim & Joel Stiebale
Upstream Collusion and Product Variety, joint with Hugo Molina
The Effectiveness of Environmental Public Policies in Multi-Level Food Supply Chains, joint with Celine Bonnet & Zohra Bouamra-Mechemache
Bargaining in Manufacturer-Retailer Relationship, joint with Justus Haucap, Ulrich Heimeshoff, Gordon J. Klein & Christian Wey, DICE Discussion Paper No 107, University of Düsseldorf