The price of corn suffered its biggest fall for 15 years on Thursday, prompting speculation that the high cost of food may start to ease.Corn prices fell 10% after a US Department of Agriculture report said that farmers were sowing unexpectedly large amounts of the grain.The price of other crops, including soybeans, also fell on speculation that future stock levels will remain high.Corn prices recently hit a record, helping to fuel inflation worries.The report said farmers in the vast crop regions of Iowa and Minnesota had been planting substantially more grain.Corn futures, which were just...