Two of the nation’s largest grocers have agreed to merge in a deal they say would help them better compete with Walmart, Amazon and other major companies that have stepped into the grocery business.

Kroger on Friday bid $20 billion for Albertsons Companies Inc., or $34.10 per share. Kroger will also assume $4.7 billion of Albertsons’ debt.

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“A Kroger-Albertsons deal would squeeze consumers already struggling to afford food, crush workers fighting for fair wages and destroy independent, community stores,” said Sarah Miller, executive director of the American Economic Liberties Project, a nonprofit that supports stronger corporate accountability and antitrust measures.

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