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Foreign exchange FX brokers Reuters EBSActual markets do not conform to simple structures. Indeed, they typically involve more than one structure. What is important, therefore, is not the operation of any specific trading mechanism, but rather the rules by which trades occur. These rules dictate what can be traded, who can trade, when and how orders can be submitted, who may see or handle the order, and how orders are processed.The rules determine how market structures work, and thus how prices are formed.Since rules can affect the behaviour of prices, liquidity might also naturally depend on how a market is structured. Indeed, liquidity concerns may dictate the structure of the market. Drawing on the extensive body of research investigating the interaction between market structure and liquidity, the remainder of this paper focuses on two critical issues in the creation of liquidity: the impact of limit orders, and the effects of transparency.