Indices for telecommunications, radio, television and satellite transmission services, hotel service, wholesale trade, e-commerce, software and IT services, and water transport all stayed at 60.

FORBES: Market Still Ignores China's Relatively Positive Economy

U.S. economic data due for release Friday includes the U.S. trade in goods and services report, and monthly wholesale trade.

FORBES: A.M. Kitco Metals Roundup: Gold Slightly Down; Little Reaction to China Economic Data

Transportation and warehousing, wholesale trade, accommodation and food services, and arts, entertainment and recreation round out the list of the six unhappiest industries to work in.

FORBES: The Happiest And Unhappiest Industries To Work In Right Now

Other U.S. economic data due for release Thursday includes the international trade in goods and services report, and the monthly wholesale trade report.

FORBES: A.M. Kitco Metals Roundup: Comex Gold Slightly Higher in Subdued Trading, As U.S. Jobs Report Awaited

Manufacturing generates about 12 percent of national GDP, a higher percentage than many other sectors including retail, wholesale trade, health care or financial services, according to data from the U.S. Department of Commerce.

FORBES: Manufacturing's heavy lifting within the U.S. economy