Fewer but larger stores than a decade ago characterize the U.S. supermarket industry. The conventional store size of 10,000 to 30,000 square feet (ft2 ) is being succeeded by superstores of 30,000 to 50,000 ft2. Format, size, sales volume, location, operating hours, and services are changing to meet the needs of the consumer. According to a 1982 survey, coupon redemption was the most popular service offered by supermarkets. Utility bill payments were the least popular. Twenty-nine percent of the stores surveyed were open longer than 15 hours per day, with 42 percent of these open 24 hours.