Mumbai, Sept. 10 -- Confidence among the U.S. small businesses increased for a second month in a row in August, largely led by stronger sales expectations and easing uncertainty, while labor quality remained the main worry for businesses, results of a monthly survey by the National Federation of Independent Business showed on Tuesday.

The NFIB Small Business Optimism Index rose 0.5 points to 100.8 in August. Economists were looking for a higher score of 101. The latest reading is about 3 points above the 52-year average of 98.

Among the main components of the headline index, four increased, four decreased, and two were unchanged.

A net 12 percent of business owners expect higher real sales volume ahead. The ratio was 6 points higher from...