To put it simply, there was a problem in Libya, which led to an overall increase in crude oil. The excessive rise of crude oil, as the world's largest crude oil consumer, the United States will inevitably be subject to all-round inflationary pressure. In order to curb inflation, it is bound to change the current loose monetary policy, and QE2 may withdraw early, or even have to raise interest rates early. This is not to hit the current American economy, and then affect the recovery of the global economy. Once the economic recovery is affected, the overall demand will decrease. As soon as the relationship between supply and demand changes, the price will naturally come down.