The Producer Price Index is a monthly report issued by the U.S. Bureau of Labor Statistics, which measures and tracks changes in wholesale prices for the output of domestic goods-producing sectors. This includes mining, scrap, manufacturing, forestry and agriculture. The PPI also monitors price changes in the service sectors, such as utilities, transportation, finance, health, legal, business services and professional services. The report is used as an indicator of overall price movements at the producer level, and can often act as a precursor to changes in the Consumer Price Index. The PPI report is closely watched for early signs of inflation.