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题目材料：
In the absence of reliable data concerning the relationship between the material quality [i.e., physical condition] and the price of used books, it is impossible to offer statistically exact information for the impact of the used-book market on the cost of reading in eighteenth-century England. Yet it can hardly be doubted that such an impact occurred, not only as the standard behavior of markets but inferentially through the innovative design and packaging strategies that London booksellers increasingly resorted to from 1760 in order to identify (and no doubt also create) more finely differentiated classes of readers. Fortunately, we can also call on extensive, independent price lists for eighteenth-century books published in Britain to track differences in the cost of new and used volumes of the same title, edition, and format. To the extent that new list prices for successive editions of the same work in a uniform format remain constant or increase at a lesser rate than consumer prices generally, the hypothesis that the secondary book market exercised a drag on book prices would gain fresh support. At the same time, variance in price among new and used copies of any given title and edition can be used as a proxy for material quality determinations in the two markets.
以上解析由 考满分老师提供。
