What happens when a teacher wants to assign an extra book for class, but the school can't afford a copy for every student?
For Dana Vanderford, an English teacher at L.W. Higgins High School in New Orleans, the book was Eric Schlosser's Fast Food Nation. Buying enough copies for her class would have cost more than $800. Not an option.
"I get $80 a year to buy resources for my classroom," Vanderford says. "And I have 90 students per semester. So that $80 doesn't go very far."