I became interested in Williams when I found out his alternate stats more closely reflected reality than the governments. There is a lot of free information available on his site. In short, the CPI has over time morphed from a cost of living index to a cost of declining standard of living index. Since this is used as a deflator of GDP, the GDP has been overstated, as will any other statistic using the CPI as a deflator. If you would like more specifics I will forward.
