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open market UK US noun [S] ECONOMICS
► an economic system where there are no rules about how much of something people can buy and sell: »
The EU is meant to be an open market, with no restrictions on purchases and sales within its borders.
► FINANCE a situation in which a country's central bank buys and sells in a financial market to increase or reduce the money supply (= the amount of money in an economy): »
When a central bank conducts open market operations, conditions in the financial sector could be affected.
Financial and business terms. 2012.