Consumer Price Index 

The Consumer Price Index (CPI) is a measure of the average level of prices of a fixed basket of goods and services purchased by consumers. The monthly reported changes in CPI are widely followed as an inflation indicator. 

The CPI is a primary inflation indicator because consumer spending accounts for nearly two-thirds of economic activity. Often, the CPI is followed but excludes the price of food and energy as these items are generally much more volatile than the rest of the CPI and can obscure the more important underlying trend. 

Rising consumer price inflation is normally associated with the expectation of higher short term interest rates and may therefore be supportive for a currency in the short term. Nevertheless, a longer term inflation problem will eventually undermine confidence in the currency and weakness will follow.