The Year-over-Year Inflation Rate measures the percentage change in the price of a basket of goods and services compared to the same month in the previous year. It is the primary gauge of purchasing power and is used by central banks to determine monetary policy and interest rate adjustments. High inflation often leads to tighter monetary policy, while low inflation may prompt stimulus measures.
It is calculated by comparing the current Consumer Price Index (CPI) to the CPI value from one year ago. The formula used is ((Current CPI - Past CPI) / Past CPI) x 100.
Super Core CPI — services excluding shelter — strips out volatile shelter costs and goods prices to isolate services inflation driven by domestic wages. Then-Fed Chair Jerome Powell singled it out as the most important gauge for reading where core inflation is heading, and it has been closely watched ever since.
