"Companies did a good job on productivity during the crisis, and they will continue to try to increase productivity to boost profits, but it's not so easy to do that from here," said Harm Bandholz, chief economist at UniCredit Group in New York.
Stocks closed mixed on Wednesday. The Standard & Poor's 500 fell 0.11 per cent to 1,403.44. The Dow Jones Industrial Average edged higher 0.09 per cent to 13,047.48. The Nasdaq Composite lost 0.19 per cent to 3,069.27.