"An understanding of economic indicators and their significance is seen as essential to the formulation of economic policies. These indicators, or statistics, provide snapshots of an economy's health as well as starting points for economic analysis. This report contains a list of selected authoritative U.S. government sources of economic indicators, such as gross domestic product (GDP), income, inflation, and labor force (including employment and unemployment) statistics."
CRS Report for Congress, R43295
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html