Consumer confidence rose to its highest level in almost 18 years in September, according to data released Tuesday.

The Conference Board's consumer confidence index defied analyst expectations, rising to 138.4 this month, according to results from the business research nonprofit. The index was up from 134.7 in August. 

The Index reached an all-time high in 2000 with 144.7. The result is a measurement of feelings on current economic conditions and prospects for the next six months, also considering business and labor markets

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