His books must sell, but he does not think of himself as an author.

And the books might sell very well as a result.

They lost their money when the book did not sell.

The book was selling for 40 percent less than the $29.95 list price.

The books still sell, although they were written 50 years ago.

Six books of French history, including one from 1890, sold for $5,175.

"Serious and religious books sell at about half that rate."

The book did not sell well at first, and was considered a commercial failure.

Books, like most products, do sell better at lower prices.

In 2003, the book had sold more than two million copies.