If you create two wages, then adults might not be able to compete for those jobs even though they likely need them more than the teenagers do. So unless you int

If you create two wages, then adults might not be able to compete for those jobs even though they likely need them more than the teenagers do. So unless you introduce quotas (there's your slippery slope), I don't see this as a good thing. Even with quotas, you run into budget constraints. There's also the fact that minimum wage cuts jobs. So if the budget allows for X hires at teenage wage and Y<X at adult wage, then it becomes even more difficult for adults to assume those jobs, meaning things like experience will count less in justifying the more expensive hire. Now without the minimum wage, you could at least give the adult a job at a lower wage than what you pay teenagers. It sucks, but if the choice is between no job and some job that pays below a fair wage, it seems the latter is preferable if you don't want to starve.