I'd also add -- do people tip Walmart workers? Waitstaff can easily make more money than a Walmart worker. If the argument is that it's morally wrong to pay a s

I'd also add -- do people tip Walmart workers? Waitstaff can easily make more money than a Walmart worker. If the argument is that it's morally wrong to pay a sub-living wage, then whether restaurant work is more skilled is immaterial to the moral problem of unlivable wages. But somehow it's moral not to tip a Walmart worker simply because of American norms?