The U.S. economy grew at a much greater-than-expected pace in the third quarter, boosted by strong consumer spending, a delayed report released Tuesday showed. U.S. GDP expanded by 4.3% in the July-September period, the Commerce Department said in its initial reading of third-quarter growth. Economists polled by Dow Jones expect a gain of 3.2%. Consumer spending expanded by 3.5% in the third quarter after rising 2.5% in the second quarter.