题目选项分析

Exports of United States wood pulp will rise considerably during this year. The reason for the rise is that the falling value of the dollar will make it cheaper for paper manufacturers in Japan and Western Europe to buy American wood pulp than to get it from any other source.

Which of the following is an assumption made in drawing the conclusion above?

【选项】Paper manufacturers in Japan and Western Europe would prefer to use wood pulp produced in the United States if cost were not a factor.