The decrease in the quantity demanded for oranges and the increase in the quantity demanded for apples is an example of the substitution effect.
The substitution effect illustrates how a change in the price of a good affects the quantity demanded of the good and the demand of substitute goods.
When the price of oranges increases, it becomes more expensive relative to apples. As a result, consumers buy more apples and less oranges. This leads to a movement up along the demand curve for oranges.
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