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Marginal utility slopes downward due to two assumptions:

1) Marginal utility satisfies Innada conditions [mathematical component].

2) Marginal utility is diminishing [economics component]. This means as a person consumes more of a good, their change in utility > 0 but is decreasing. As consumption -> infinity, utility is 0.

Summary: Slopes downward because utility is increasing at a decreasing rate.

Real-life example: the first slice of Pizza you eat tends to be the most filling or 'the best'. However, as you eat more and more pizza, your happiness from eating the pizza is falling because you don't get as much benefit from it.

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Q: Why does marginal utility slope downward?
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