You shouldn't take advantage of someone with down syndrome.
One of James' classmates, Alan, has Down Syndrome and gets $10 from his parents every day to buy lunch.
James wants enough money to buy a candy bar at lunch.
James offers to help Alan with his homework in exchange for $2.
James sells white gravel to Alan, telling him that the pebbles are diamonds.
James is able to afford his candy bar and Alan has a slightly easier time in school.
James is eventually caught and given a week's worth of lunch detentions.