Ten years ago, a study similar to the one reported here indicated that 240 acres were large enough to realize most of the cost economies coming from farm size alone. But machinery improvements since have changed the picture.
Heady, Earl O. and Krenz, Ronald D.
"How Big Will Our Farms Get? Report No. 2,"
Iowa Farm Science: Vol. 16
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol16/iss5/2