Investing.com - U.S. financial markets will be shut on Monday for the Martin Luther King Day holiday.TuesdayEarnings season is underway in the U.S. Look for reports from Citigroup (NYSE:C) and UnitedHealth. The U.K. reports on producer prices.Wednesday Alcoa (NYSE:AA) and Goldman Sachs (NYSE:GS) report earnings. On the U.S. economic front, the Fed's Beige Book is released.ThursdayHousing starts, building permits and jobless claims are all due out, while Schlumberger releases earnings.FridayGermany and Switzerland report PPI data, and the University of Michigan releases its consumer sentiment survey