> How many other companies of that size can say the same?
This is a bit of a strawman argument. How many other companies exist on planet Earth of this size? Very few. And are you insinuating that Walmart is paying well because they want to? I doubt it. They are tried-and-tested mega corp that responds to labour market pressures. I don't attribute anything else to this level of pay. Finally, average isn't a good metric to use; median is more useful.
If we leave size aside, I would say that Starbucks and Whole Foods are very good employers and large.
I was not insinuating that. The bigger you get as a corp, the harder it is to do have a mutually beneficial relationship with your employees, -because- market forces dictate so much of the strategy. So, that Walmart is the literal biggest corp and can still have legit upward mobility and satisfied mid-level employees is no small feat.
If we leave size aside, I would say that Starbucks and Whole Foods are very good employers and large.