The government says the broadest measure of the U.S. economy expanded by two percent between July and September. The U.S. stock market opens at 9:30 am, Eastern; futures are lower. The Commerce Dept. also says the GDP grew during the second quarter, by 1.7%. The agency says its initial findings show consumers spent more money on services, but the housing market dragged down significant advancement. It's good news but weak and could be a key factor for Federal Reserve policymakers. They're meeting next week in Washington, and could buy more U.S. Treasury bonds, a move called quantitative easing. Our pals at Planet Money explain why that might be the Fed's next option.