Federal Reserve Chairman Alan Greenspan (search) said Wednesday the U.S. economy is growing at a "reasonably good pace" but urged Congress to move quickly to fix the country's budget deficits and its Social Security and Medicare problems. "Addressing the government's own imbalances will require scrutiny of both spending and taxes. However, tax increases of sufficient dimension to deal with our looming fiscal problems arguably pose significant risks to economic growth and the revenue base," Greenspan said in testimony prepared for delivery to the House Budget Committee (search). "The exact magnitude of such risks is very difficult to estimate, but, in...