OK, a fair criticism of the "toy" model, which was simplified to make the point. There are always multiple choices of productivity and wage level, and big moves (more than doubling employee productivity, while simultaneously quadrupling the cost of labour) usually can't happen quickly.
Back in the real world, I did a quick look at the economic evidence, and was surprised. The latest evidence base is that the minimum wage has surprisingly little effect on anything. It seems to have no discernible effect on employment levels - see here - but it has no clear net impact on training levels either - see here.
One problem is that minimum wages tend to be varied only marginally, so it is hard to see a big effect. However, the UK provides a more dramatic experiment, where minimum wages were abolished in the 1990s, then re-introduced a few years later. Some UK assessment here on employment and on training. Again, not a big impact in either case, though training levels apparently did increase among groups affected by the minimum wage. This suggests the toy model is not totally daft.
Interesting reading, although I'm always leery of relying on a single meta-analysis of a politically charged subject. For the sake of argument, though, let's take it as given that increasing the minimum wage has no or only a small effect on employment rates. Where's the money coming from, then, and what would we expect that to do to the economy?
First option: It's a free lunch; the money would otherwise go to line the pockets of (spherical, behatted, cigar-chomping) capitalists. This is implausible to me on priors, but we can put bounds on how far we c
Note: Originally posted in Discussion, edited to take comments there into account.
Yes, politics, boo hiss. In my defense, the topic of this post cuts across usual tribal affiliations (I write it as a liberal criticizing other liberals), and has a couple strong tie-ins with main LessWrong topics:
The issue is this: recently, I've seen a meme going around to the effect that companies like Walmart that have a large number of employees on government benefits are the "real welfare queens" or somesuch, and with the implied message that all companies have a moral obligation to pay their employees enough that they don't need government benefits. (I say mention Walmart because it's the most frequently mentioned villain in this meme, but others, like McDonalds, get mentioned.)
My initial awareness of this meme came from it being all over my Facebook feed, but when I went to Google to track down examples, I found it coming out of the mouths of some fairly prominent congresscritters. For example Alan Grayson:
Or Bernie Sanders:
Now here's why this is weird: consider Grayson's claim that each Walmart employee costs the taxpayers on average $1,000. In what sense is that true? If Walmart fired those employees, it wouldn't save the taxpayers money: if anything, it would increase the strain on public services. Conversely, it's unlikely that cutting benefits would force Walmart to pay higher wages: if anything, it would make people more desperate and willing to work for low wages. (Cf. this this excellent critique of the anti-Walmart meme).
Or consider Sanders' claim that it would be better to raise the minimum wage and spend less on government benefits. He emphasizes that Walmart could take a hit in profits to pay its employees more. It's unclear to what degree that's true (see again previous link), and unclear if there's a practical way for the government to force Walmart to do that, but ignore those issues, it's worth pointing out that you could also just raise taxes on rich people generally to increase benefits for low-wage workers. The idea seems to be that morally, Walmart employees should be primarily Walmart's moral responsibility, and not so much the moral responsibility of the (the more well-off segment of) the population in general.
But the idea that employing someone gives you a general responsibility for their welfare (beyond, say, not tricking them into working for less pay or under worse conditions than you initially promised) is also very odd. It suggests that if you want to be virtuous, you should avoid hiring people, so as to keep your hands clean and avoid the moral contagion that comes with employing low wage workers. Yet such a policy doesn't actually help the people who might want jobs from you. This is not to deny that, plausibly, wealthy onwers of Walmart stock have a moral responsibility to the poor. What's implausible is that non-Walmart stock owners have significantly less responsibility to the poor.
This meme also worries me because I lean towards thinking that the minimum wage isn't a terrible policy but we'd be better off replacing it with guaranteed basic income (or an otherwise more lavish welfare state). And guaranteed basic income could be a really important policy to have as more and more jobs are replaced by automation (again see gwern if that seems crazy to you). I worry that this anti-Walmart meme could lead to an odd left-wing resistance to GBI/more lavish welfare state, since the policy would be branded as a subsidy to Walmart.