题目选项分析

If the county continues to collect residential trash at current levels, landfills will soon be overflowing and parkland will need to be used in order to create more space. Charging each household a fee for each pound of trash it puts out for collection will induce residents to reduce the amount of trash they create; this charge will therefore protect the remaining county parkland.

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

【选项】The collection fee will not significantly affect the purchasing power of most residents, even if their households do not reduce the amount of trash they put out.