Jeff Currie, Goldman Sachs, Global Head of Commodities Research, says oil markets are caught in a vicious negative feedback loop. Michael Spence, Nobel laureate & General Atlantic Senior Adviser, says the global economy has shifted and become supply constrained. Carl Weinberg, High Frequency Economics Chief Economist & Managing Director, says the Bank of England has no choice but to hike. Ray Farris, Credit Suisse Chief Economist, says the worst is yet to come for equities.