The family-run drugstore on Main Street has been dying for decades. Now, the big national chain pharmacies—which helped push those family operations to the brink of extinction—are being surpassed in terms of total locations by dollar stores. What does this say about how people shop nowadays? And about the state of the economy? One of the hottest retail trends in recent years has been the rise of the dollar store. During a period when many retailers have struggled as a result of consumers scaling back, dollar stores boomed for obvious reasons—one way consumers cut expenses was by spending more time...