output data. In principle, data could be presented at an “atomic” level, such that the atoms could be aggregated in any way the user wished. As a practical matter, decisions must be made about which aggregations are worth making, as has been done historically for the NIPAs and will need to be done for the satellite accounts. Categorization by industry has proven useful, as has the consumption and investment delineation and the separate presentation of information for government and private entities. In advocating the development of a nonprofit satellite account, we are in essence making the case for expansion of the ownership criterion to include separate designation of the nonprofit form. For some purposes, one may wish to know, for example, the size and activity levels of the hospital and education industries, and their changes over time. For other purposes one may wish to know the size and activity level of the government, nonprofit, and for-profit sectors across industries. Viewed in this way, detailed information about industries does not make the government and nonprofit accounts redundant with other nonmarket accounts, such as health and education.