Average American eats close to 90 grams of protein per day. Average Japanese eats 56 grams of protein. Average Indian, Chinese eats 33 grams of protein per day. Average corn yields in USA for years 1990-118bu/A, 2010-153 bu/A. Guess what yields were in 1975? If corn is $7/bu now, what would it be if we had 1990 yields?