Wal-Mart, the company that brought you $4 generics, is making business a bit more challenging for competitors with a new program designed to offer consumers even better deals on both prescription and over-the-counter medicines. The company announced yesterday that it would expand its $4/30-day generics program and also reduce prices on a number of medicines not covered under its $4 plan. What will the new phase of Wal-Mart's discount RX and OTC medicine program mean for retail competitors?

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