Professor John Crespi has authored an article in American Journal of Agricultural Economics with Chen-Ti Chen, an Iowa State graduate and current Assistant Professor at The Ohio State University, Gabriel Lade, Associate Professor at The Ohio State University, and David Keiser, Professor at the University of Amherst. Lade and Keiser are both CARD Faculty Collaborators as well. Chen et al. authored "Size-based regulation and water quality: Evidence from the Iowa hog industry," which examines the growing prevalence of animal feeding operations (AFOs) in the United States and studies the effects of the 2003 Clean Water Act regulations that targeted water pollution from the largest hog AFOs. The authors find that the regulation decreased ammonia concentrations downstream of large hog AFOs by 6–8 percentage points and find limited to no evidence of improvement for dissolved oxygen and phosphorus concentrations.
Size-based regulation and water quality: Evidence from the Iowa hog industry
Chen-Ti Chen, Gabriel E. Lade, John M. Crespi, David A. Keiser
American Journal of Agricultural Economics https://doi.org/10.1111/ajae.70006