Researchers study effects of reducing concentrate output 20 percent through direct supply control (marketing quotes) on farm labor, land, capital and net farm income under 19 different farm siutations in Iowa.
Mayer, Leo V.; Heady, Earl O.; and Butcher, Walter
"Direct Supply Control: What Effects on Iowa Farms?,"
Iowa Farm Science: Vol. 19
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol19/iss1/3