Koichi Yonezawa specializes in quantitative marketing, retailing, food marketing, and empirical industrial organization. His research uncovers marketing insights by analyzing consumer choices in food retail markets, quantifying relationships in vertical supply chains, and investigating pricing strategies for consumer packaged goods. His work has been published in journals such as the Journal of Retailing, the American Journal of Agricultural Economics, and the European Review of Agricultural Economics.

His recent research interests include investigating the sources of household food waste, exploring the impact of user-generated content on product development, and evaluating the welfare consequences of quantity discounts in the food retail sector.