Jeff Bezos called for Amazon's competitors to raise their minimum wage. Here's how retail rivals like Walmart, Target, and Costco stack up on worker pay.

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Amazon CEO Jeff Bezos called out retail rivals like Walmart.

• Amazon CEO Jeff Bezos called for competitors to match the company's $15 minimum wage in his letter to shareholders.
• Amazon raised its minimum wage to $15 per hour in October.
• Here's how entry-level pay at retail rivals such as Costco, Walmart, and Target compare.

Amazon CEO Jeff Bezos is challenging his retail rivals to boost their minimum wage.

"Today I challenge our top retail competitors (you know who you are!) to match our employee benefits and our $15 minimum wage," Bezos wrote in Amazon's annual letter to shareholders on Thursday.

"Do it! Better yet, go to $16 and throw the gauntlet back at us," he continued. "It's a kind of competition that will benefit everyone."

Amazon raised its minimum wage to $15 per hour in October. And, while the federal minimum wage remains $7.25 per hour, many other retailers are similarly raising pay.

Read more: Amazon is raising its minimum wage to $15 following pressure from Bernie Sanders

Here's how some of the biggest names in retail stack up as companies compete to win over workers.