Thor Power Tool Company v. Commissioner, 439 U.S. 522 (1979) was a United States Supreme Court ruling which changed the way companies are allowed to depreciate their unsold inventory. Thor?s inventory was overestimated, and was written down to scrap, but it did not immediately scrap the items or sell them at reduced prices. Thor treated the write-down of excess inventory as an adjustment to closing inventory increasing the costs of goods sold and reducing tax due. An unforeseen side effect of this decision was that it became less profitable for publishers to keep slowly but regularly selling books in print (their backlist). Some argue that this has made it harder for midlist authors to make a living because books tend to be remaindered or pulped and go out of print more quickly.
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