To maximize utility,why does a consumer consume the combination of goods that equates marginal utility per dollar from the different goods rather than just equating the marginal utility of the different goods?

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The Answer of To maximize utility,why does a consumer consume the combination of goods that equates marginal utility per dollar from the different goods rather than just equating the marginal utility of the different goods?

To Maximize Utility,why Does a Consumer Consume the Combination of Goods