In figure 3-4, the current position of the demand curve is D1, and the price of a

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In figure 3-4, the current position of the demand curve is D1, and the price of a portable power bank, which is a normal good, is $3. If there is an increase in consumer incomes, will the demand curve shift to D2 or to D3? What is the change in the amount of portable power banks demanded?
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