A method and system for trading financial instruments which reduces the leakage of trading interest when buyers and sellers of financial instruments desire to trade. Accordingly, in one embodiment, a trading system allows traders to speculate on the hidden liquidity in the market by offering liquidity at fixed prices which are inferior to the NBBO (National Best Bid Offer) in exchange for rights to sweep the market for better priced quotes. In another embodiment of the invention, a liquidity provider can set their own fee. This fee is charged to the liquidity taker if their quote is executed. This fee compensates traders for the risk of taking a position in a financial instrument. In another embodiment of the invention, dummy orders are used to reduce trading interest leakage when limit orders are placed into order books. In another embodiment of the invention, a trading system will only match liquidity taking orders with single liquidity providing orders of equal or greater in size.