Question $29(1$ point$)$ Retake question

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Why do we use the "real" prices of goods to measure how expensive things have become?

a$)$ to see whether there have been any changes in our purchasing power

b$)$ to estimate the periods when hyperinflation has occurred

c$)$ to find out what the inflation rate has been

d$)$ to find out what the current prices of goods and services are