Ag Econ Search is a free，open access repository of full-text scholarly literature in agricultural and applied economics，including working papers，conference papers，and journal articles．Ag Econ Search is co-sponsored by the Department of Applied Economics and the University Libraries at University of Minnesota and the Agricultural and Applied Economics Association．Research in Agricultural and Applied Economics collects，indexes，and electronically distributes full text copies of scholarly research in the broadly defined field of agricultural economics including sub disciplines such as agribusiness，food supply，natural resource economics，environmental economics，policy issues，agricultural trade，and economic development．

For more information，please sign in http：／／ageconsearch．umn．edu／