Mark Perry properly describes the minimum wage. Think of it this way: if politicians regarded the activity of employing of low-skilled workers to be a vice (in the same way that they regard, say, the smoking of cigarettes to be a vice) they would impose a sin tax on that activity. Well, the minimum-wage is indeed such a tax.
My former student Howie Baetjer writes about water.
Paul Poirot debunks the myth that sweatshop labor should be stopped by government intervention.