Falling oil prices which started in late 2014 have highlighted an increased emphasis on the cost of producing oil, particularly from shale oil formations in the U.S. With 50 percent of U.S. oil production coming from U.S. shale, analysts initially estimated breakeven prices for shale oil operations to be at $75 per barrel, then lowering those estimates to $50 per barrel, and now, in some core regions, breakeven prices are as low as $30-$35 per barrel.

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