New York City Mayor Zohran Mamdani warns that DoorDash’s proposed $17 billion acquisition of Instacart could raise consumer prices, calling the deal an example of corporate consolidation.

The criticism puts potential costs to customers at the center of a deal DoorDash and Instacart are pitching as a way to offer consumers more choice and savings while strengthening their ability to compete with companies including Walmart and Amazon .

Customers of both delivery platforms, grocery retailers and Instacart’s approximately 600,000 independent-contractor shoppers could ultimately be affected if the transaction wins shareholder and regulatory approval.

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DoorDash is offering approximately $17 billion to acquire Instacart, the grocery and convenience delivery company founded in 2012.…