The pace of US economic growth increased in the final three months of 2011, according to official figures.
The economy grew at an annualised rate of 2.8%, the Commerce Department said.
This was up from the 1.8% annual rate recorded in the previous quarter, although it was slightly lower than the 3% rate predicted by analysts.
However, the growth largely came from businesses stockpiling goods they had produced, rather than selling them.
Although the stockpiling lifted the figures, analysts believe businesses will not continue doing this, resulting in a lower growth figure for the current quarter.
The pace of consumer spending picked up to 2% from 1.7% in the previous quarter.