Minimum wage: $15 per hour
Costco has already matched Amazon's minimum wage. In March, the company raised its minimum wages from $14 and $14.50 up to $15 and $15.50.
It had been less than a year since Costco last raised its minimum wage, from $13 to $14. This change impacted around 130,000 employees.
Minimum wage: $15 per hour
"We strongly believe that this will benefit our business as we invest in our employees," Bezos wrote in his annual letter to shareholders on Thursday.
"But that is not what drove the decision," he continued. "We had always offered competitive wages. But we decided it was time to lead – to offer wages that went beyond competitive. We did it because it seemed like the right thing to do."
Minimum wage: $13 (starting in June)
Earlier in April, Target announced it is raising its minimum starting pay to $13 an hour, up from $12 an hour. The new minimum wage will take effect in June.
CEO Brian Cornell announced in March that the company was "committed" to raising its starting wage to $15 an hour by 2020.
Minimum wage: $11 per hour
In January 2018, Walmart announced plans to raise entry-level pay to $11 an hour.