Inflation One commonly used measure of inflation is the annual rate of change of the Consumer Price Index (CPI). A TV new story says that the annual rate of change of the CPI is increasing. Check all of the following that must be true. The graph of CPI is concave upward. The second derivative of CPI is negative. The derivative of CPI is positive. The second derivative of CPI is positive. The graph of CPI is concave downward. The derivative of CPI is negative.

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