Free goods

Free goods are products with a natural abundance of supply and do not require any deliberate effort to obtain. Hence, people do not place a value on their production or consumption. Thus, free goods are not tradeable owing to their unlimited supply and the absence of demand. Examples include air, desert sand, seawater, airwaves, rainwater, sunlight and (to some extent) public domain web pages. There is no opportunity cost in the production or consumption of free goods.