CPI expected to drop but could still disappoint investors -CIO

STORY: The Labor Department's consumer price index (CPI), expected before Tuesday's opening bell, is this week's main event, and will be scrutinized for any clues regarding the length and severity of the Federal Reserve's policy tightening phase.

Economists polled by Reuters expect monthly CPI to have contracted 0.1% in August, edging down to 8.1% year-on-year, mainly due to the recent cool-down of commodity prices.