In a blog post published this morning, the White House explains why historic economic data has been updated. "The comprehensive revision to the national accounts, which is the first since July 2009, includes additional source data received by the Bureau of Economic Analysis, as well as methodological changes designed to better reflect the evolving nature of the U.S. economy," writes Alan B. Krueger, chairman of the Council of Economic Advisers. "This morning the Bureau of Economic Analysis released a comprehensive revision to the National Income and Product Accounts, covering the full history of data since 1929. The revision showed that...