Operators of many small farms in Iowa aren't getting very large returns for the amount of time they spend farming. Size in acres doesn't tell a full story. But, within limits, farm size and income go hand in hand.
Heady, Earl O. and Seagraves, James
"Iowa's Small Farm Problem,"
Iowa Farm Science: Vol. 10
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss6/2