Food inflation fell to 8.84 per cent in the week ended September 10 from 9.47 per cent in the previous week, prices of key commodities however continued to rule high. As per Wholesale Price Index (WPI) data released by the government on Thursday, prices of most commodities, barring wheat, continued to remain firm on an annual basis. Experts, say the fall in inflation on a weekly basis is on account of statistical reasons, called as high base effect. Food inflation was above 16 per cent in the corresponding period last year.As per the data, wheat prices during the week were down 2.72 per cent year-on-year. However, onions became more expensive by 29 per cent and potatoes 13.78 per cent. Overall, vegetables became 12.13 per cent dearer. Overall, inflation in primary articles stood at 12.17 per cent for the week ending September 10, compared to 13.04 per cent in the previous week.