“Since January 1, retailers have announced plans to shutter more than 6,700 stores in the U.S., according to Fung Global Retail & Technology, a retail think tank. That beats the previous all-time high of 6,163 store closings, which hit in 2008 amid the financial meltdown, according to Credit Suisse. Walgreens helped vault this year’s tally to a new high when it said Wednesday that it plans to close about 600 locations.