Saudi Arabia and OPEC may have dropped oil prices to stifle production in the U.S. and other competing nations, but they didn’t drop it enough to stifle the U.S. oil and gas boom from fracking, a senior expert with McKinsey and Company said in Chicago. “If the Saudis think they’re going to put U.S. shale players out of business, they’re probably not, although there will be less drilling,” Joe Quoyeser told about 125 people, mostly graduate students, at Northwestern University’s Kellogg Energy Conference on Wednesday. ”But there are other elements of oil supply that are needed to balance the market...