Arnd Klein

Arnd is a Senior Principal at Keystone, specializing in antitrust, competition economics, and the competitive implications of platform and algorithm design.

Prior to joining Keystone, Arnd spent over a decade working across regulation, litigation consulting, and in-house roles. Most recently, he spent more than three years at Amazon leading Competition and Seller Economics in the Buy Box team, where he advised leadership, product, engineering, and science teams on the competitive impact of ranking algorithms and marketplace design. He led regulatory compliance initiatives related to EU and UK antitrust commitments, represented Amazon before external auditors, and designed experiments and machine learning based approaches to assess business and competition outcomes.

Earlier at Amazon, Arnd supported U.S. and international competition matters as part of the Litigation and Regulatory Economics team. Prior to Amazon, he worked at Cornerstone Research, advising clients and government agencies on high-profile antitrust litigation across technology, healthcare, and financial services. He began his career as an economist at the Swiss Competition Authority, handling abuse of dominance, collusion and merger investigations and contributing to competition policy advocacy in digital markets.

Arnd has published academic and policy research on competition and digital platforms, including work in Management Science, Games and Economic Behavior, Antitrust Magazine and Competition Policy International.

Outside of work, Arnd enjoys spending time with his family and exploring the outdoors in the Pacific Northwest with his wife and two young sons.

Education

• Ph.D. in Economics from the University of Zurich
• M.Sc. in Economics from the University of Oregon
• Diplom (M.Sc.) in Economics from the University of Konstanz