Let’s say an apple and a pear normally cost 1 dollar, each. Now, let’s imagine an apple’s price becomes 2 dollar. People will naturally move from buying apples to pears, as they are more affordable. So, the demand for pear grows, while the number of available pears stays limited to what is produced. So, the price naturally goes up, too, as people need to eat fruit and are willing to pay more for pears, as apples became expensive.
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