As the peak holiday shopping season approaches, most U.S. consumers have a downbeat outlook on the economy, according to an annual Deloitte survey published on Wednesday. Most consumers surveyed — 57% — said they expect the economy to weaken in the year ahead, the consulting firm found in a poll of roughly 4,000 respondents. That compares to 30% who expected a weaker economy ahead of the year-ago holiday season and 54% in 2008, one of the years of the Great Recession. It marks the most negative