Jim Chanos, head of the world's largest short-selling hedge fund, told CNBC on Friday he's been short major oil companies for a couple years because the North American shale explosion has been "uneconomic for drillers."
"The fracking and shale revolution was propelling us to be the largest oil producer in a way that I thought was uneconomic and still is uneconomic for the drillers. But it was going to be enough supply to really disrupt the markets," he said.
The founder of Kynikos Associates, with $3 billion in assets under management, has been betting against the economic situation in China for some time now. "We came across China because of our work in the mining sector in 2009."