For a list of tradable commodities futures contracts, see List of traded commodities. Coffee is also bought and sold by investors and price speculators as a tradable commodity. The indices comprise FTSE/ASEAN Benchmark Index and FTSE/ASEAN 40 tradable index. Sometimes teeth (particularly the less common gold teeth) were also seen as a tradable commodity. Financial instruments are tradable financial assets of any kind. Liquid financial instruments are easily tradable and have low transaction costs. A security is a tradable financial asset. There should be no distortions in purchasing power parity for perfectly tradable goods. Trade exists because different communities have a comparative advantage in the production of tradable goods. Dutch disease makes tradable goods less competitive in world markets. In the United States, a security is a tradable financial asset of any kind. In this context, foreigners have the role to choose only the useful tradable goods sectors. Outsourcing results from an internationalization of labor markets as more tasks become tradable. C.R.E.D.D. granted 30 days of playtime and is tradable to other players for in-game currency. Speculation can in principle involve any tradable good or financial instrument.