Patrissimo posted an
entry about negative effects of the minimum wage, in at least
one example. The example is an interesting one, and shows some problems with the minimum wage. I used to have arguments with a friend about whether the minimum wage was a good idea or not -- she was going to business school, and claimed that increases in the minimum wage will cause losses of jobs, so it has a net harmful effect on people who would otherwise have those jobs.
It's a reasonable argument, and one
supported by libertarians in general. My principal weapon in the argument was a
fascinating study by a couple of Princeton guys who found that minimum wage hikes don't seem to have any real effect on employment. The obvious rebuttal is that their study is flawed, as
argued by the
Cato Institute, a libertarian think tank. Their argument is basically that there are lots and lots of studies that do find an effect, and so this study must be wrong, and they point out some flaws.
But (last link, I promise) there's also a
great article on
Slate about why all those studies are flawed. It's in the context of opposing the minimum wage on other grounds, interestingly.
Anyway, basically I believe after reading all these things that raising the minimum wage does in fact make people with minimum wage jobs as a group better off, which is what it's intended to do, and that it doesn't really cost significant numbers of jobs in the process. I do think the Slate article has a point, though, which is that minimum wage increases might not be the best or fairest way of achieving that goal.
Caveat: of course large increases will have an effect. If you set the minimum wage to be $100/hour, all kinds of bad things happen. It's just that changes in the minimum wage seem to create proportionally smaller changes in employment, so small movements have nearly negligable effects.