Let me give you an example that comes from my own experience. If I haven't got a degree yet, although I've got more than 90% of collegue done, I get paid about $700/month. When I get the degree I'll magically get paid at least $2400/month. Have I just increased my efficiency 3.5 times in the second I get the title that says I've finnished college? Hell no. So I know that while I'm being paid $700/month my real value is MORE than $2400. So when we rise the minimum wage what normally happens is NOT that the job is killed, but that the surplus value is lowered, creating a wealth redistribution.
Right, this is exactly right for the 1% of people with the $700/month job that are 90% of the way to their college degree. However, for the other 99% of the people with that job who aren't being underpaid because of an unusual quirk in how employers judge value, ...