Your idea of "fair" and mine are apparently irreconcilable. Employer saying "we need people to do X job for Y pay, is anyone willing?" is entirely fair.

If overqualified people are feeling it necessary to take up those jobs because the rest of the economy is so bad, then obviously the solution is not to twist the arms of the fast food joints but to address the issues preventing the economy from proper functioning.

Even if there WAS a leftist "solution" to fast food wages, the opportunity cost is way to high to even think about looking there for the solution.

You say "corporations" lots of food joints are actually independently owned, even franchises are independently owned and the owners just pay a franchise fee. Left wing solutions lack real world credibility.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)