油价下跌会促进世界经济发展,并打击一些令人讨厌的政权——但也存在风险。1991年苏联的解体有许多原因,但最根本的莫过于其主要出口商品的问题,即其石油价格扣除物价因素后,在1980至1986年间下跌了三分之二。同理,苏联的承袭者弗拉基米尔·普京14年来的统治一直受益于油价高达3倍的上涨。现在,油价正再度回落。自6月份以来,布伦特原油价格已经从每桶约115美元跌 Falling oil prices will boost the world economy and crack down on the nasty regimes - but there are risks. There were many reasons for the dissolution of the Soviet Union in 1991, but the most fundamental problem was its major export commodity. After deducting the price factor, its oil price dropped by two thirds between 1980 and 1986. By the same token, the fourteen years of rule by Vladimir Putin, a successor to the Soviet Union, have always benefited from a threefold rise in oil prices. Now, oil prices are falling again. Since June, Brent crude oil prices have dropped about 115 U.S. dollars a barrel