The Consumer Price Index is an economic indicator that is usually released on a monthly basis. It tracks the changing value of goods and services purchased by consumers within a country. Inflation is closely related to the value of a country’s currency as central banks can raise interest rates to counterbalance rising inflation. CPI is considered an important indicator by traders, as rising consumer prices are one of the most accurate indicators of inflation within a country. When a nation’s CPI data comes in lower than expected, it is considered a good sign for the national currency.