The Billion Prices Project uses computers to make a price index from a huge number of prices listed on the Internet. This index is updated daily and provides a better real time indication of price changes than anything else I have found. It is up about 2% in the last 6 months. This is an annual rate of about 4%. Maybe this is just a blip and maybe it is the start of something. In any case, BPP will be interesting to watch.