Saintbertholdt: "Is a minimum wage a good idea? And how should it be determined?"
In this type of economy (and my idea of an economy is so radically different than most people's) a minimum wage is necessary to prevent de facto slavery.
How should it be determined? That's a relatively simple equation:
Rent in a moderate rent area (Not too poor and not too rich) + Basic food costs times the number of dependents (No eating out on a regular basis) + Car mileage and car insurance expenses for driving to and from work and supermarket + Utility and Internet bills + 20% for unforeseen circumstances which always occur.