On the European market, the barrel of oil price is nearing 80$, at its highest for three years. This trend is all the more spectacular since it comes at a time when the OPEC members are not achieving an agreement about the evolution of their production. Traditionally, in this case, prices were falling because the lack of an agreement allowed each member to increase its production and the total supply quickly became superior to the demand. The United Arab Emirates have blocked the negotiation because they ask a reevaluation of their quota of 600 000 barrels per day. But they ...