Reflecting inflation concerns, 3M's MMM.N CFO said on Monday that Q3 inflation is higher than thought and that it was outstripping price . August U.S. CPI USCPI=ECI is due Tuesday and estimates show a possible moderation in price increases from the July result, but there is still the risk of an upside surprise. Should August CPI surprise to the upside, investors are likely to doubt the Fed's view that rising inflation is transitory.