AUTHOR=Chen Yangyang , Cheng Ming TITLE=The Minimum Purchase Price policy in China and wheat production efficiency: a historical review, mechanisms of action, and policy implications JOURNAL=Frontiers in Nutrition VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1536002 DOI=10.3389/fnut.2025.1536002 ISSN=2296-861X