物物交换市场

The competition rule on a stock market selects buyers and sellers to form belateral contracts. This rule is generalized to non-bilateral contracts. The set of offers is seen as an acyclic graph that make barter nearly as liquid as bilateral markets using money. Competition occurs between paths of the graph formed by possible relations between offers. Multilateral draft contracts are formed by the winner; a group of cooperating participants. openBarter consists in a server connected with depositories certifying the reality of measurable values offered and exchanged. These depositories record the property transfer when agreements are signed by owners. The main time consuming primitives of the server are 1) read the best price for a couple of values requested and provided, and 2) make an offer. A single simplifying hypothesis is used to limit computation load: the number of partners of contracts is limited, for example 4,8 or 16. This explains why the liquidity of openBarter is not str