Let's imagine that you're in Florida or some third-world country like that, and a man in a black suit comes up to you and tries to buy a single kidney from you.
The procedure will be safe and not hugely painful, but it'll take a few weeks to recover. Also, you would only have two kidneys so you wouldn't be able to exercise or some s*** like that, not that this bothers most of y'all probably.
How much would you charge this man to snatch your kidney from you? This is a one-off payment, so choose wisely.
