Across the menuCornThe cost of bacon, ham and other pork products will go up because hogs are eating more expensive corn.SoybeansThe cost of cooking oil and margarine could rise because they are made from soybeans, now at a near-record $16 a bushel.WheatThe cost of bread has risen because wheat supplies are tight as farmers switch to planting corn for ethanol.Pain in the pantryPrices for staples h