The year just ending is expected to show one of the biggest-ever stock market falls. With only three trading days left, the S&P 500 is down 41 percent. Economic reports this week are expected to bring more bleak news. The recession has hit all sectors — from banks to autos to commodities and resources. Unemployment has climbed as house prices plummet and cash-strapped consumers curtail spending, which is putting more pressure on struggling companies.