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rader Peter Tuchman shares a laugh with a specialist trader from Barclays Capital on the floor of the New York Stock Exchange June 11, 2010. U.S. stocks rose in a late rally on Friday as a strong forecast from a chip maker lifted tech shares and helped alleviate concerns about the economy's health after an unexpected drop in retail sales. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS IMAGES OF THE DAY)

Oil rockets to monthly high on Opec deal

But market watchers doubt price will climb higher in reaction to deal and believe rally may be short-lived