In general it is possible to obtain data on quoted international prices, but there may be opaqueness in terms of the prices that are agreed privately between buyers and sellers, and in terms of other determinants of domestic prices, such the levels of private and public stocks. Following the 2007-08 price spike, an Agricultural Market Information Service (AMIS) was created by the G20 in order to improve market transparency, by providing a common pool of information on prices, production, trade, utilisation and stocks for major crops (wheat, maize, rice, soybeans) as well as on the policies that affect prices. This system is progressively improving information on the markets for key food staples and the policies that govern those markets.