Suppose that only one person in the world sells ice cream. He employs a strange pricing policy: You can buy 1 ice cream cone for $1, but if you buy 2 cones, you have to pay $2 each. If you buy 3, you have to pay $3 each, etc., so that if you buy 10, you have to pay $10 each. You have $100 dollars to spend on ice cream cones and chocolate milk, and chocolate milk costs $1 per unit. Draw your budget constraint. This strange ice cream pricing, where buying more costs you more, is called a quantity surcharge.