Stock futures drop as uncertainty around US trade policy hung over markets, threatening the end of the S&P 500's longest winning streak in two decades. Oil prices fall as OPEC+ agreed to increase output, raising concerns over a global glut. Warren Buffett's surprise announcement that he will step down as CEO of Berkshire Hathaway by the end of the year drags shares down in pre-market trading. Sonja Marten of DZ Bank says we shouldn't write off the dollar despite its rapid depreciation and Jack Caffrey of JPMorgan Asset Management says the Fed wants to be friendlier. “Bloomberg Brief” delivers the market news, data and analysis you need to set your agenda.