I don't know if it's been posted already or not, but there are intangibles that go along with a giant min wage bump like this.
If I'm working at Burger King, and I have been there for 3 years and I've worked my way to to $15/hr by being the best employee I can be, how hard am I going to try when the laziest guy in the joint makes just as much money as I do now?
Hush you, with your logic and facts, being all confuse-y and such!