U.S. consumer spending recorded its biggest decline since late 2009 in December, with households appearing to save the extra cash from cheaper gasoline, which could support future consumption.
Other data on Monday showed factory activity slowed in January, suggesting economic growth continued to cool early in the first quarter.
The Commerce Department said consumer spending, which accounts for more than two-thirds of U.S. economic activity, fell 0.3 percent after a 0.5 percent gain in November.
It was the largest drop since September 2009 and reflected big declines in spending on both durable and nondurable goods.
When adjusted for inflation, consumer spending was the weakest since last April.
In a separate report the Institute for Supply Management said its national factory activity index fell to 53.5 last month from 55.1 in December. A reading above 50 indicates expansion in the manufacturing sector.
U.S. stocks were trading lower on the reports. Prices for U.S. government debt fell and the dollar eased against a basket of currencies.
The spending data was included in Friday's fourth-quarter gross domestic product report, which showed the economy growing at a 2.6 percent annual pace, with consumer spending rising at a brisk 4.3 percent rate - the fastest since 2006.
Despite ending 2014 on a weak note, lower gasoline prices and a firming labor market are expected to provide a huge tailwind to consumer spending in the first quarter.
"This all bodes well for consumption growth in early 2015," said Paul Diggle, an economist at Capital Economics in London.
Households have so far used much of the extra income from cheap gasoline to pay down debt and boost savings, according to economists. Gasoline prices have plunged 43 percent since June, according to U.S. government data.
In December, income at the disposal of households after accounting for inflation increased 0.5 percent, the largest rise since last March. The saving rate rose to 4.9 percent from 4.3 percent in the prior month.