There are six categories of economic exchanges that are omitted from GDP calculations. One such category is government transfer payments (like unemployment insurance payment), because it represents transfers of income without new production. Another category is blank , because because they are unpaid and not part of market transactions. A third category is blank , because the transactions are unreported. Another category is blank because they are a transfer of ownership and do not represent current production. Another category is blank because only final goods are counted in the GDP. Another category is blank because it is difficult to estimate their market value