• currencies - They include mainstream currencies like dollar, euro, pound etc. As well as growing number of alternatives like bitcoin, ripple, LETS and more. They have in common creation of virtual artifact and attempting to use it for measuring people perceptions of values.
• barter - In barter people exchange directly without using any virtual artifacts like currencies. In most cases by just looking what each party has to offer and than simple exchanging it.
• timeshare - In timesharing communities people use a natural measurement - time. People consider everyone’s time having same value and don’t make up hourly rates as it often happens in currency based systems.
• shared benefit - Shared benefit systems make an assumption that if we decide to support something with our contributions. We care about outcome of such collective effort. By participating in them we have possibility of choosing how we want to direct certain share of such beneficial outcome. Collectives practicing it can use many various ways of assigning shares of created benefit to individual contributions.
• social karma - Various systems incorporating elements of trust and reputations related to concept of social karma In what we could consider its pure form, for our contributions we only ask for public confirmation of them. This way over time we build up a portfolio which we can later present to others. It can play very well in situations where we support causes which we find beneficial for everyone in general. Also when we want to share something scarce, like a round trip to the moon, we can take advantage of social karma in process of choosing to who we want to offer them.
• free sharing - This system requires no accounting at all. All transactions happen because we want to share and care about each other. As more and more goods we can make abundant it becomes much simpler to freely share them.
Via Christophe CESETTI