Third quarter U.S. growth increased at a 4.1% rate, slightly lower than previous estimates of a 4.3% growth rate, the Commerce Department said Wednesday. The downward revision was unexpected by Wall Street economists, who had forecast Q3 GDP to be unrevised at a 4.3% rate. The second revision to real gross domestic product in the July-September quarter found a downward revision to consumer spending. Inflation measures were revised slightly higher; the core personal consumption expenditure price index increased at a revised 1.4% annual rate, up from the previous estimate of a 1.2% increase. Corporate profits were revised lower.