Koichi Yonezawa specializes in food retailing, food manufacturing, quantitative marketing, and empirical industrial organization. His research provides policy and managerial insights by analyzing consumer choices in food retail markets, quantifying vertical supply chain relationships, and exploring strategies for consumer packaged goods manufacturing and retailing. 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 identifying the primary sources of household food waste, examining the value of user-generated content for product improvement and quality control, and assessing the welfare implications of quantity discounts in the food retail sector.