Which economic concept is the reason behind Disney World's pricing policy involving discounts for multiple-day passes?

Question

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The law of diminishing marginal utility states that as a consumer consumes more and more of a good, the additional satisfaction or utility from each additional unit decreases. In the case of Disney World's pricing policy, offering discounts for multiple-day passes incentivizes consumers to purchase more days at the park, which may increase their overall satisfaction but at a decreasing rate (i.e. diminishing marginal utility).

Which Economic Concept Is the Reason Behind Disney World's Pricing