WASHINGTON (MarketWatch) -- The U.S. consumer confidence index jumped to 92.4 in August, the highest level since October 2007, from a revised 90.3 in July, the Conference Board said Tuesday. Economists polled by MarketWatch had expected the index to pull back to 88.5 from an originally reported 90.9 in July. The present situation index, a measure of current conditions, rose to 94.6 from 87.9. The future expectations index declined to 90.9 from 91.9. Confidence has now increased for four straight months, and consumers "remain quite positive about the short-term outlooks for the economy and labor market," said Lynn Franco, director of economic indicators at the board.