... the one that was done with a 'double blind' testing system, I'll pay attention to the results. Until then, there are far too many factors to establish any true cause/effect.
But I do know this ... living on a minimum wage salary has NEVER, in my entire 35 years in the labor force, been a 'living wage'. That's why most people learn new stuff and don't stay in it for more than a few months.
Or until they get motivated enough to find something else so they can move out of their mom's basement.
I have little sympathy for someone that can't find anything but a minimum wage job and then have to stay in it. I remember a few years ago when I saw a sign at a local fast-food place advertising a starting salary over $9/hour, a full $2 higher than the minimum wage at the time. When I looked behind the counter, I understood why, the staff was actually WORKING. The owner could afford the higher salary because he needed fewer people because they worked harder.
People with good attitudes and a willingness to learn don't make minimum wage for very long. People with limited skills who aren't very self-motivated do.
That's called 'competition' and it works very well. Subsidies (that is, paying more for something than it's worth) rarely work in the long term. They become crutches and excuses. The US has a long history of such failures .. student loans (increases tuition costs, created a price spiral, saddled thousands with high debt), housing subsidies (increased house prices and created a bubble), Cash for Clunkers (didn't do a damn thing), farm subsidies (can't get rid of the hidden tax that all US citizens that pay taxes pay for that ends up costing 50% of the population almost 3 times what the actual subsidy would be to them in terms of taxes and national debt), etc.
Too bad we haven't learned from these mistakes..