GRE阅读写作分析--How to stop the drug wars_GRE写作

GRE阅读写作分析--How to stop the drug wars

　　Yet prohibition itself vitiates the efforts of the drug warriors. The price of an illegal substance is determined more by the cost of distribution than of production. Take cocaine: the mark-up between coca field and consumer is more than a hundredfold. Even if dumping weedkiller on the crops of peasant farmers quadruples the local price of coca leaves, this tends to have little impact on the street price, which is set mainly by the risk of getting cocaine into Europe or the United States.

　　Nowadays the drug warriors claim to seize close to half of all the cocaine that is produced. The street price in the United States does seem to have risen, and the purity seems to have fallen, over the past year. But it is not clear that drug demand drops when prices rise. On the other hand, there is plenty of evidence that the drug business quickly adapts to market disruption. At best, effective repression merely forces it to shift production sites. Thus opium has moved from Turkey and Thailand to Myanmar and southern Afghanistan, where it undermines the Wests efforts to defeat the Taliban.