If a consumer is at equilibrium while consuming two goods, X and Y, where an indifference curve intersects their budget line, which of the following conditions must hold true for maximizing utility?

At equilibrium the consumer chooses a bundle where the willingness to trade one good for another equals the market trade needed. Other options are incorrect because The idea that a person will spend all money on one good comes from the mistake of thinking only one item gives maximum pleasure; Assuming one good is always better is a common misunderstanding that ignores price and how much one values each item.