Commercial hog farms in 1987-91 had an average inventory of 2,000 hogs and operated 400 acres, according to the USDA's Farm Costs and Returns Survey (FCRS). Average net farm income ranged from $23,410 per farm in 1988 to $48,162 in 1990. The average operation's equity position improved each year and 72 percent of all operations were profitable in 1991.