<p>Assembly line worker Edward Houie moves a door into position for a 2012 Chevrolet Volt at the General Motors Hamtramck Assembly plant in Hamtramck, Mich., in July 2011. The U.S. economy grew at a 2.8 percent annual rate in the final three months of last year, the fastest growth in 2011, according to the Commerce Department.</p>

January 29, 2012