Digital printing has saved the book industry. The old business model that printed an excess of books has been replaced for many titles by a more efficient on-demand model. Consider my personal example: Back in 1972, I wanted to self-publish a book. I only wanted 500 copies, but the printer said the minimum run was 5,000. I still have 4,000 copies in the warehouse, because someone may want a book on 1970s phototypesetting some day.
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