Giving Away E-Books to Sell the Printed Word

In the same year that the National Academy Press began offering 2,100 titles free through its web site, the
company also experienced a record growth in sales of printed books. How?
They acted on some simple but revolutionary insights into the way each medium is used:

It would seem axiomatic that giving away pages means that fewer people will buy the books, but that confuses the content with the product. Sugar, butter, flour, eggs, and vanilla are the contents of a pound cake, but quite obviously more than those contents is required to create something pleasing to the palate. It\’s clear to us that the material we publish — the final printed book — has a value quite distinct from the content itself, and a utility independent of any particular page. The handy, readable, formatted, bound volume is still the way most people want to read a book-length work . . . To my knowledge, no book by any publisher has ever sold less than expected because it was available free online.

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