Pharmacies large and small make money in two ways. Both are under threat. Walgreens’ announcement Tuesday that it plans to shutter 1,200 locations over the next three years made headlines, but that doesn’t mean it was a surprise. The company is losing money and indicated a significant closure announcement was coming this past summer. And among pharmacies large and small, Walgreens is not the exception; it’s the rule. CVS announced it would close 300 locations earlier this year. Rite-Aid has