GDP excludes most items that are produced and consumed at home and that never enter the marketplace.
It excludes items produced and sold illicitly, such as illegal drugs, money from prostitution and gamble.
GDP does not count transaction in which money or goods changes hands but in which no new goods and services are produced, such as won lottery.
Used goods: because these goods were part of GDP in the period in which they were produced and during which time they were new goods.
Financial Assets (Nonproductive Financial Transactions): When households buy financial assets such as bonds and stocks, they are making loans, not buying goods and services.