This is great.
Without the minimum wage, in South Africa, whites would only work for, say, $5 an hour while blacks would work for $1 an hour. Even if the employer is a racist, it would actually cost him to be a racist: it would cost him $4 an hour PER employee. But with a minimum wage law, it doesn’t cost him to be a racist, so he’ll just hire all white workers. This is fantastic stuff.