Amazon raised its minimum wage for all workers to $15 an hour. In their recent letter to shareholders, they challenged their top retailers to follow suit. According to Jeff Bezos, CEO of Amazon, raising the minimum wage is an investment towards their employees that strongly benefits the company; their intention to raise the minimum wage wasn’t just to gain a competitive advantage, but rather it was “the right thing to do.” Large corporations such as Target and Costco have raised their minimum wage as a result; however, Walmart has not followed suit. Notably, labor union representatives have raised concerns about the potential degradation of the work environment and conditions as a result of increased wages.
See "Amazon CEO Jeff Bezos challenges rival retailers to raise their minimum wages, too", Sarah Perez, Tech Crunch, April 11, 2019