When Brazil is production efficient and increases its production of ethanol from 40 barrels per
day to 54 barrels per day, it must decrease its production of food crops from 3 tons per day to 2
tons per day. The opportunity cost of the additional ethanol is 1 ton of food per day for the
entire 14 barrels of ethanol or 1/14 of a ton of food per barrel of ethanol.