Gross state product (or gross regional product) is a measurement of the economic output of a U.S. state or an Australian state. A US state is any one of the fifty subnational entities of the United States of America that share Sovereignty with the federal government The Commonwealth of Australia is made up of 8 states and territories controlled under a federal system of government It is the sum of all value added by industries within the state and serves as a counterpart to the gross domestic product or GDP. Value added refers to the additional value of a commodity over the cost of commodities used to produce it from the previous stage of production
Conceptually, there is no difficulty in taking the definition of GDP for a nation and applying it to a smaller jurisdiction such as a state, or even a local government area. In practice, however, flows of goods, services, labour and capital across state boundaries are not measured with any great accuracy. By contrast, flows across national boundaries are normally recorded as part of the ordinary operations of government. As a result, it is often hard to measure the value added within a state, since this requires netting out 'imports' from other states, and including 'exports' to other states. Similarly, it is difficult to measure the income accruing to factors of production (labour and capital) within a given state.