While this didn't involve a currency, it reminds me of the concept of supplementary currencies, where a token is used to exchange an abundant resource for a sca

While this didn't involve a currency, it reminds me of the concept of supplementary currencies, where a token is used to exchange an abundant resource for a scarce one, with better overall allocation. I supppse in this case, the resources were parking spaces and security. Luckily there was a coincidence of wants, and so no token was needed. Slum sanitation and bus tokens in Curitiba are the classic example of the sort of supplementary currency I mentioned, for anyone interested: https://books.google.ca/books?id=hBfQdF3EhXAC&lpg=PA142&ots=jSUG3u0fbI&dq=currency%20bus%20tokens%20garbage&pg=PA142#v=onepage&q=currency%20bus%20tokens%20garbage&f=false https://books.google.ca/books?id=hBfQdF3EhXAC&lpg=PA142&ots=...