Over-all farm size has a lot to do with income from the farm. This article shows how different-sized farms in the state fared in 1949. It shows how income varied and where farm costs played their part.
Seagraves, James and Heady, Earl O.
"How Do Iowa Farm Incomes Stack Up?,"
Iowa Farm Science: Vol. 9
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol9/iss6/4