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- Walgreens plans to close a "significant" number of underperforming US stores.
- The move highlights recent and longer-term challenges facing the company and its competitors.
- CEO Tim Wentworth said the industry is "largely overbuilt" given how the past decade has unfolded.
Thursday's news that Walgreens will close a "significant" number of underperforming stores threw a spotlight on struggles facing the retail pharmacy industry.