U.S. factories boosted output last month and December ended up being their best month of growth in five years.
Strong auto sales and growing business investment in machinery and other equipment are keeping factories busy and helping the economy grow.
The Federal Reserve said Wednesday that manufacturing production increased 0.7 percent in January. And output soared 1.5 percent in December, according to an upward revision. That's the biggest one-month gain since December 2006.