Says who? Is this great proclamation of yours based on any sort of economic theory or rational thought process (I'm guessing no) or is it just some arbitrary standard that sounds good to you? There is a point where it is beneficial for an employer (and the employee, and society in general) to pay higher wages. Here's a hint: it's not at some arbitrary point determined by a third party.
That out of the way, what you short bussers don't take into account is that employers will simply raise their standards. If I pay new hires $20,000/year and it is mandated that I pay them $25,000/year, I'll stop hiring people whose labor is worth $20k and start hiring people whose labor is worth $25k. You can dictate how much must be paid but you can't dictate who'll get hired.
