Abstract
Reuse is generally considered to have environmental benefits, but it has not yet been widely adopted in environmental policy or strategy. In this paper, a simple model of second-hand markets is explored with a case study of used books that illustrates the behavior of the model and shows that such a model is consistent with the data. Three questions of the dynamics of reuse are addressed: (1) If it becomes easier to buy and sell used goods (via Internet markets or other means), by how much will sales of used goods increase? (2) When sales of used goods increase, by how much will sales of new goods decrease? (3) When is reuse better than recycling? Expanding from the case study, the model is used to examine how reuse affects the consumption of new goods, and the relative merits of reuse versus recycling. When the used goods market is small, the ratio of the price of used and new goods, an observable quantity, is approximately equal to the fractional decrease in sales of new goods that will result from increased sales of used goods. A formulation of the environmental impact of reuse and recycling is developed that includes the market impact of reuse. Illustrating this formulation for books with a simplified analysis, reuse of books through sales in a second-hand market is estimated to save more than twice as much energy, with considerable uncertainty, than making books from recycled paper. The formulation provides a basis for identifying products and markets for which reuse can be an effective environmental strategy.
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Notes
The BISG data cited above suggests that sales of used books in book stores and other locations have been approximately constant for the past several years. If used book sales in stores and other locations were constant from 1997 to 2003, used book sales in the late 1990s would have been about 70 million per year, rather than 30 million books per year estimated by IPSOS in Table 1. Moreover, the data in Table 1 show a surprisingly large increase in used book sales in 2002. These issues underscore that the used book data should be considered as illustrative rather than definitive.
The sales of new and used books will be taken as proportional to the fractions of the population buying new and used books. This is equivalent to the assumption that the same number of books are bought by individual new and used book buyers.
Used books remain a small fraction of the total book market, and thus any environmental consequence of used book sales will be correspondingly modest. Nevertheless the potential material consequences are worth noting. From 1997 to 2003, sales of used books have increased from 36 million to 160 million books per year (Table 1 and US Census), an increase of 125 million books per year. The reduction in new book sales is, as modeled here, is very roughly about 0.7 times the sales of new books, or about 90 million books per year. With the average book weighing about 0.5 kg (Table 2), this amounts to, very roughly, about 45,000 tons per year.
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Edited by Eiji Hosoda, Keio University, Japan.
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Thomas, V.M. The environmental potential of reuse: an application to used books. Sustain Sci 6, 109–116 (2011). https://doi.org/10.1007/s11625-010-0115-z
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DOI: https://doi.org/10.1007/s11625-010-0115-z