NZ just raised our min wage to $20 an hour. I work at least 50 hours a week. A teenager at MacDonalds now earns a good fraction of my income if they work the same hours. Despite my 4 year degree, near decade of experience and the responsibility's that I hold.
So, McDonalds employees should not have a good salary because... It hurts your feelings? I've seen better arguments. You are playing exactly in the game that the extremely wealthy want you to play. Being disdainful or even hateful of the teenager that flips burgers all day long, while they delegate their entire work, do nothing but lines of cocaine and jet-ski while you kill yourself working 50 hours a week (most lik…
The extremely wealthy probably don't care that much - they aren't reducing their income to afford an increased minimum wage, they're reducing yours.
(Assuming, of course, that you are not part of the extremely wealthy).
When a business's costs increase, they pass it on to the consumers (you). When they can't pass it on any further they reduce their costs, with the easiest cost to reduce being employee costs. Since they can't reduce the cost of minimum wage, they'll reduce the costs of the other employees.
You can't rein in the excesses of the extremely rich by mandating minimum wage. You might be able to do so by regulation (tax rules, maybe? Clamping down on tax havens would do more to even things out than any other step you may wish to take).