The minimum wage in South Africa is $1,45 an hour and if you learn less than $2.35 an hour you don't pay any income tax and a lot of people fall into that range or even prefer to remain in that range and then get paid cash for extra days.

I never really understood the minimum wage apart from being a political talking point, people are going to monetise their time and couldn't be arsed by what people who don't work a day job decide the price should be