Wholesale prices rose less than expected in December, a positive sign for the economy amid recent market fears that inflation isn't falling as quickly as hoped to the Federal Reserve's 2% target.

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.

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.