You often hear that you should “get your money’s worth” when going to a buffet, and the best way to achieve that is to ignore anything cheap and load up on the most expensive meats. Since the price is the same regardless, the intuition would be that value comes from maximizing the monetary cost of what you eat. However, economists define value differently. What individuals should actually try to maximize is utility.

Utility is an economic concept used to describe preferences. If someone chooses one option over another, they reveal that the choice, for that individual, has higher utility than the other, at least at that specific moment.

Utility says more is never worse, so getting more of something only gives you more utility, but how much you can get is subject to constraints. The most common constraint is income. At a buffet, the monetary constraint disappears once the entry fee is paid, but scarcity does not. The binding constraint becomes physical capacity. Because your stomach can only fit so much food, every choice has an opportunity cost: consuming more of one item involves giving up the chance to consume something else that could have provided more satisfaction. The cost of a choice is not price anymore, but the utility of the next best alternative.

Economists represent these tradeoffs through indifference curves, which show combinations of goods that give the same level of utility. Moving along an indifference curve means trading one good for another while remaining equally satisfied. The slope of the curve is the marginal rate of substitution; it captures how willing someone is to substitute between two different goods.

This concept relies on assumptions regarding preferences. It is assumed that preferences are complete, meaning people can rank different bundles. They are transitive, meaning their rankings are consistent, and, lastly, people usually prefer variety, which is why indifference curves are curved rather than straight lines.

This clarifies why “getting your money’s worth” is often misunderstood. The entry price to the buffet is a sunk cost: once it’s paid, it cannot be recovered and should therefore not affect marginal decisions. Letting sunk cost dictate behavior leads people to chase expensive items even when they would actually enjoy something else more.

So, returning to the buffet example, if someone genuinely prefers the bread or salad to another serving of meat, then eating those items will maximize utility. The rational choice is not the most expensive plate, but the one that delivers the greatest satisfaction considering scarcity. Economics doesn’t reward chasing the price, it rewards choosing what you actually value.

WORK CITED LIST
Emerson, P. M. (2019, October 28). Preference and indifference curves. Intermediate Microeconomics.
https://open.oregonstate.education/intermediatemicroeconomics/chapter/module-1/