Food Prices To Rise For Years, Biofuel Firms Say UK: April 4, 2008 LONDON - Staple food prices will rise for some years, but should eventually fall to historical averages as harvests increase, biofuel company executives said on Thursday. Soaring demand for better quality food from rapidly industrialising emerging markets such as China, supply shortages, increased demand for biofuels, and a surging appetite for food commodities by investment funds, have combined to push prices of basic foods higher and higher in recent months.