Economy best in four years, an article from CNNMoney.comhttp://money.cnn.com/2007/11/29/news/economy/gdp/index.htm, reports that despite a hit from the housing and credit markets, the nation's economy grew at a 4.9% rate in the third quarter, according to the government's latest reading.  That is up from the 3.9% growth rate in the government's initial estimate for the period.  The gross domestic product, the broad measure of the nation's economic activity, matched the consensus forecast of economists surveyed by Briefing.com.  New readings showed stronger exports, spending by individuals and growth of business inventory lead to the large upward revision.  The growth was the best rate since the same period of 2003.