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Walgreen's proposed acquisition of Rite Aid could have a big impact on high drug prices, but how remains to be seen.

The $17.2 billion deal announced Tuesday would create the largest pharmacy chain in the U.S. if regulators approve it. Some experts say the combined chain could reduce costs and create more leverage when negotiating with drug companies over prices, while others are worried the consolidation could hurt consumers.

High drug prices have become a top problem in the U.S.. A poll released Wednesday found many people were concerned about how to afford pricey drugs that treat ailments such as hepatitis and cancer.

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