Inflation is necessary for economic growth but needs to be at the right level to drive spending among businesses and consumers.The inflation rate, expressed as a percentage, reflects the changing purchasing power of consumers and businesses.Maintaining a steady rate of inflation is crucial, and it is one of the key responsibilities of the Federal Reserve.The Consumer Price Index (CPI) and the Personal Consumption Expenditures Price Index (PCE) are the key indexes used to calculate inflation in the U.S.CPI tracks a basket of goods and services, while PCE tracks prices that businesses report selling goods and services for.Core CPI excludes volatile food and energy prices, while Core PCE is considered the most important measure of inflation by the Federal Reserve.High inflation can depress purchasing power, while too-low inflation hinders economic growth by keeping money out of the economy.Inflation affects the purchasing power of a currency, leading to changes in the cost of living as prices rise.Inflation can dilute the purchasing power of fixed incomes but may make it easier to pay off debts like mortgages.Investing is a way to combat inflation and grow purchasing power, as returns on investments historically exceed inflation rates.