If I had a valid driver's license and adequate funds, I could buy a Red Car if I wanted to. I could also choose not to buy a red car for all sorts of reasons. I could decide I don't like the color or that I was afraid the color would make me a target for police. I could think back to some bad experiences I had with red cars. There was the time my friend wrecked his red car after hitting an invisible patch of ice. And there was the time a stranger driving a red car fired at least two bullets into a car I was riding in.
Based on these reasons or many others, I could decide I wanted nothing to do with a red car. But what if that wasn't good enough? What if I decided to prohibit anyone else from owning a red car?