[me_me_me]

> If littering is equivalent to throwing money, you simply won't do it.

I have learnt that when organising events at work (sponsored by workplace), you have to charge people. Any amount like €5, its two cups of coffee but turn-up rate is in high 90% of people that paid upfront. Without charging any money its 50-60%

The number of people that sign up were pretty similar, so I hazard a guess that risk aversion was at play.

Its a powerful tool even if you know about it.