I buy a new book for approximately $15 from my local bookstore.
After I finish reading, I sell it to someone else for $14.
After they finish reading, they sell it to someone else for $13.
After they finish reading, they sell it to someone else for $12.
After they finish reading, they sell it to someone else for $11.
After they finish reading, they sell it to someone else for $10.
After they finish reading, they sell it to someone else for $9.
After they finish reading, they sell it to someone else for $8.
After they finish reading, they sell it to someone else for $7.
After they finish reading, they sell it to someone else for $6.
After they finish reading, they sell it to someone else for $5.
After they finish reading, they sell it to someone else for $4.
After they finish reading, they sell it to someone else for $3.
After they finish reading, they sell it to someone else for $2.
After they finish reading, they sell it to someone else for $1.
After that last person finishes reading, they give it to the local library.