经过多年不同程度的使人感到失望之后,1987年铜的价格远远超过了最乐观的预计,到年底按美元计的铜价比年初上升了140%,虽然铜价格的这种变化多少得归因于美元的极度疲软,但基本原因完全是由于金属铜供应的短缺。然而就今年头四个月来说,市场的行情显然都是下跌的趋势,仅在5月份价格才开始大幅度上升。即使在这样的情况下,人们仍广泛 After years of varying degrees of disappointment, the price of copper in 1987 far exceeded the most optimistic expectation, and by the end of the year the price of copper in the United States rose by 140% over the beginning of the year, although this change in copper prices was attributed somewhat Extreme weakness in the dollar, but the basic reason is entirely due to the shortage of copper metal supply. However, for the first four months of this year, the market prices are apparently declining. Only in May did the prices start to rise sharply. Even in such situations, people are still extensive