Anyone can see recent weeks a continuous rise of financial markets. The CAC 40 has taken more than 30% since its low points (from 2,500 points to over 3300 points), the price of oil climbed by almost 60% (36 to $ 58 per barrel). The volatility has fallen sharply and the risk aversion has returned to levels close to the beginning of 2008. Asian markets have taken between 20 and 40% since the beginning of the year, Brazil is even better. We can speak of a real rally or stock buyers seem now to have resumed power over sellers. The question that interests us here is to understand this sudden increase in violent and financial