The law of diminishing marginal utility gives us a deeper understanding of the downward-sloping demand curve because

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The law of diminishing marginal utility states that as a consumer consumes more of a good, the additional satisfaction (or utility) they derive from each additional unit decreases. As a result, consumers are willing to pay a higher price for the first few units of a good when marginal utility is high, but will be willing to pay less for additional units as marginal utility decreases. This explains the downward-sloping demand curve - as the price of a good decreases, consumers are willing to purchase more of it because the marginal utility they derive from each additional unit of the good increases.

The Law of Diminishing Marginal Utility Gives Us a Deeper