The United States implemented mandatory country of origin labelling (MCOOL) which became effective in March 2009 (USDA AMS, 2009a,b), write Glynn T. Tonsor, Jayson L. Lusk, Ted C. Schroeder, and Mykel R. Taylor in a research paper for Kansas State University.   MCOOL requires grocery retailers to provide country-of-origin labeling […]