This is the rationale here. I am in two minds about it actually. Part of me feels like many in this thread, equal pay for equal work. At the same time teens and young adults were having issues finding jobs because they had no experience of work and with rising unemployment employers were more willing to hire older workers with references from earlier jobs. Young adults were not getting the experience needed.
Like PPs son it was drummed into me that you work hard you move up in the company and that is what happened to me. However I see students daily who don't have that from home. Students who,seem to lack an understanding of what the real world is like. For these students getting the lower paying job at McDs might be a step in the right direction.
As I said, I'm still mulling on this one.