Hacker News Reader

> because people who can afford helmets generally choose to wear

A helmet is much cheaper than the bicycle is it not? If you can afford the bike you can probably get the helmet.

Homeless people don't buy many things. If they have something, it's probably one of the few things they owned and were able to keep when they became homeless.

The costs are additive, unless you think there are people buying the helmet without a bike.

Reply on news.ycombinator.com