BigBrand Water Filter Inc, CBC Marketplace, Infowars shop, and Lowe's are few examples of firms or companies that sell house water filtration systems.

There are many well-known internet marketing firms. Some of the more well-known internet marketing firms include Full Media, Gazdoog, Helix House, Top Rank, and Outspoken Media.

There is one actual purpose of a clearing house. A clearing house stands between two clearing firms and reduces the risk of a clearing firm failing to honor its trade settlement obligations.

Marion House Scholl Hawley has written:

'Employment and wage payments in Alabama in firms covered by unemployment compensation, 1939-1946'

In a two sector model there is no government control. There are just two sectors (1) the households (2) the firms. No government control means there would be no taxes, no subsidies and no social security. Also Economy will be a closed one meaning NO TRADE. House hold will supply factors of production to firms and will receive income in against them and thus they will use these incomes to buy what ever has been produced by firms. Where as firms will hire factors of productions and will pay house holds and will produce goods and service which are to be used by house holds and thus will receive income in against them

NOTE: One sector's expenditure is another sector's income.