That's easily explained though. Students don't have a lot of money and textbooks are next to rent and in some cases tuition the most expensive thing you're goin

That's easily explained though. Students don't have a lot of money and textbooks are next to rent and in some cases tuition the most expensive thing you're going to buy as a student. Students in the US are already comfortable paying enormous amount of money for the education, students in Europe much less so and students in India and Pakistan simply can't afford to pay what US students can. Still even if your profit margin is much smaller, that's still a large market, so you sell these books in India with a smaller profit margin and increase them in Europe and the US. Additionally universities in the US forcing students to buy certain textbook creating monopolies also certainly doesn't help prices to stay down.