Much of the increase in food costs has been raw commodity price inflation that has generally started to reverse this year.Now is the time of the year when Christmas sales dominate economic news, and the recent National Retail Federation report will add some fuel to the fire that the economy is not growing. The Christmas season can account for up to 40 percent of all annual retail sales. Those sales from Thanksgiving Day (28 November) to the following Sunday (1 December) are down three percent from last year. Digging a bit deeper, however, finds that there are some significant offsetting data.First, the Christmas shopping season is shortened this year by almost a week and spans 26 days compared with 32 days last year. Second, Hanukkah starte...