Darlene is trying to decide which item to purchase first, a sundae or a milkshake, knowing that she wants to receive the most utility for each dollar she spends.

Darlene should consider the amount of utility, or satisfaction, she will receive for each dollar she spends when deciding which item to purchase first. A sundae typically has more ingredients and will likely provide more utility for each dollar spent than a milkshake. Additionally, Darlene should consider portion size and how much utility she will receive from each item. Generally, a sundae will provide a larger portion size and therefore more utility than a milkshake.