You could probably add blood to that list too. I’m not sure it even applies seeing as sometimes it is not even possible to buy/sell blood and I should clarify that I only heard about this on a tech related stand up comedy. It made for a good joke nonetheless.
I just want to add that a good portion of buyers think they are “saving the environment” by buying an electrical car because it doesn’t burn any fuel. However I was amazed when I realized that most of them don’t understand that the electricity their car uses is most probably (around 94% [1]) generated using fossil fuels and due to loss of energy during transmission they are in fact less efficient than your good old gas burning car.
[1] this 94% is just what I remember from some years ago. seeing as countries and governments have started adapting renewable forms of a energy recently it’s probably not as bad but still far from ideal which means the point still stands.