WSJ
U.S. oil prices soared 10% on Thursday, as a rally in Chinese and U.S. stocks and better-than-expected U.S. economic data prompted a rush by traders to bail out of bearish bets that the market would fall.
Traders and analysts at hedge funds, banks and brokerages said supply-and-demand conditions in the oil market remained weak and there appeared to be little fundamental justification for such a strong rally, or expectations of more price gains in the near future. Rather, they said, it appeared to be set off as investors with so-called short positions that profit from falling prices closed those bets out as the market turned against them.
Brazil Energy Insight 
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