Ralph wants to buy some milk and a box of cereal. If Ralph buys 2 quarts of milk at $1 per quart, the box of cereal costs 75 cents. If he buys 3 quarts of milk at $1 per quart, the box of cereal is free. For Ralph, the marginal cost of the third quart of milk is:

Consider the budget line in the above figure. If the consumer has income of $240, what is the relative price of movies?

A) .42 books B) 2.4 books C) $10 per movie D) $24 per movie

A consumer's indifference curves are right angles when, for the consumer, the goods in question are __________

Fill in the blank(s) with correct word