There are growing concerns about the stickiness of inflation and fears that the Federal Reserve may have to keep interest rates restrictively high for longer.

The December figure marked a deceleration from monthly producer-price increases in November, when prices rose by 0.4%.

U.S. producer prices rose less than expected in December as higher costs for goods were partially offset by stable services prices, suggesting inflation remained on a downward trend after progress had stalled in recent months.

US stocks gained after cooler-than-expected producer price index data soothed inflation concerns. The numbers on Tuesday showed wholesale inflation rose 0.2% in December on a monthly basis, compared to an estimated 0.4% increase. The reading climbed 3.3% from a year ago, below the projected 3.5% gain.

US stocks gave up earl\y gains to end mixed. Investors await key consumer inflation data and the start of earnings season on Wednesday.

U.S. stocks are ticking higher following an encouraging update on inflation. The S&P 500 rose 0.4% in early trading Tuesday. The Dow Jones Industrial Average was up 163 points, and the Nasdaq composite was 0.