<P> For measuring output of domestic product, economic activities (i.e. industries) are classified into various sectors . After classifying economic activities, the output of each sector is calculated by any of the following two methods: </P> <Ol> <Li> By multiplying the output of each sector by their respective market price and adding them together </Li> <Li> By collecting data on gross sales and inventories from the records of companies and adding them together </Li> </Ol> <Li> By multiplying the output of each sector by their respective market price and adding them together </Li> <Li> By collecting data on gross sales and inventories from the records of companies and adding them together </Li>

Us gross domestic product does not include which of the following