Buoyed by strong consumer spending and higher business investment, the US economy expanded in the third quarter at its fastest pace in two years, according to newly revised government figures. Gross domestic product climbed at a 4.1% annual rate from July through September, the Commerce Department said today. Previously the increase was reported as 3.6%. The news pushed the US stock market up 70 points early morning trading. Consumer spending, the main driver of the US economy, rose 2% instead...