The city you need to earn more to have the same purchasing power is city B.
Purchasing power can be referred to as the amount of goods and services a given amount of money can buy. Inflation affects purchasing power of money.
For example, consider a person that earns 9,000. If the person lives in City A. The individual earns wat more than the cost of living in city A. On the other hand, if the person lives in city B, the person is just earning enough to survive in city B. In order to have the same purchasing power with the person in city A, the person in city B has to earn more.
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