Huffman, Wallace E., Matthew Rousu, J.F. Shogren, and A. Tegene. "The Welfare of Implementing Mandatory GM Labeling in the United States," in R.E. Evenson and V. Santaniello, Eds., Consumer Acceptance of Biotechnology Foods, CAB International, forthcoming.

Controversy surrounds the introduction of genetically modified foods. One key issue relates to tolerance levels—the impurity rate tolerated before a commodity must be labeled. Currently, the United States has not defined a tolerance level for genetically modified foods. This paper uses data...