In the villages of Bali (Indonesia), there are two currencies: the official national currency (rupiah), and a second currency, based on time and exclusively created by the community. It is about 3 hours. When the community needs to organize a festival or to build a school for example, two budgets are planned: one in national currency and the other in "money time." The poorest people in the village can invest more time into the project and less money, while the more rich members of the group will inject more cash. This form of cooperation between individuals and the dual system of currency is the cement of Balinese society. It allows people to participate on an equal footing in the financing of joint projects and may, within the limits of do no harm to their community, to participate in the financing of other projects in other communities.