What's a "Big" Farmer?

From Farmgate, here's a possible definition of what a farmer is, so a big one would be bigger than this:

How much acreage or livestock does it take for you to earn a living on the farm? One farm business management group in MN offered its calculations based on its members:
1) 890 acres of corn, based on a net return of $84.03 per acre over a 5 year average.
2) 970 acres of beans, based on a net return of $77.15 per acre over a 5 year average.
3) 369 acres of hay, based on a net return of $202.77 per acre over a 5 year average.
4) 4,380 head of farrow to finish hogs, with $17.08 per head over a 5 year average.
5) 15,568 head of finish hogs, with a $4.51 net return per head over a 5 year average.
6) 831 head of feedlot calves, with a $89.98 net return per head over a 5 year average.
7) 127 head of dairy cows, with a $509.96 return per head over a 5 year average.

The biggest surprise to me was no. 3.