Based on Justin's marginal-utility-to-price ratio, we can infer that he did not maximize his utility but he can do so by consuming more candy bars and less juice and gas.
For the purchases to maximize his utility, the marginal-utility-to-price ratio for all the goods purchased need to be equal.
In order to achieve this, Justin needs to buy less juice and gas as they have high ratios, and focus on consuming more candy until all the goods have the same marginal-utility-to-price ratio.
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