Gross Domestic Product (GDP) is the most comprehensive measure of the output (product) from all industries within a county. Like its widely followed national-level GDP counterpart, GSP represents a market valuation of the goods and services—both private and public—produced within a county economy.

Think of GDP as calibrating the “producing power” of a county by the place-of-work of those workers employed within that county, although they may reside elsewhere. County Personal Income, by contrast, is representative the “purchasing power” of those that reside within a county, although they may work elsewhere.

For a more detailed and technical explanation of the current and constant dollar estimates of Gross Domestic Product (GDP) by County compiled by the Regional Product Branch of Bureau of Economic Analysis please refer to the BEA website on this topic.