The cost economics which come with different sizes of forms aren't the only factors which affect form size. But, coupled with risk and uncertainty, they do have an important influence on changes in farm size.
McKee, Dean E. and Heady, Earl O.
"How Big Will Our Farms Get?,"
Iowa Farm Science: Vol. 9
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol9/iss11/2