“The Commerce Department has made changes to how it calculates gross domestic product, designed to have the data better reflect the so-called knowledge economy. The U.S. government adjusted data all the way back to 1929, and other countries have or are about to make similar changes to their data. At the same time, the government also went back and revised data for the past five years.What’s the upshot? The rate of growth hasn’t changed all that much, though there are big shifts in a few time periods. But the level of output is higher — $559.8 billion larger, with $526 billion of that amount due to definitional changes.”
http://www.marketwatch.com/story/the-new-gdp-methodology-what-you-need-to-know-2013-07-31
