Bartering's a medium in which goods or services are directly exchanged for other goods and/or services without a common unit of exchange (without the use of money). It can be bilateral or multilateral, and usually exists parallel to monetary systems in most developed countries, though to a very limited extent. Barter usually replaces money as the method of exchange in times of monetary crisis, when the currency's unstable and devalued by hyperinflation. Bartering's still common in the present,… (More on Barter)