買賣差價
bid and ask spread
每個即賣即買報價（不論報價是由單一莊家作出或載於限價委託紀錄內）之間的差價。證券買賣差價的幅度是衡量市場流動性及交易成本高低的指標。
Each namely selling ready-quote (whether offer is made by a single dealer or limit order is contained in the minutes of) the difference between. Securities spreads magnitude is a measure of market liquidity and low transaction costs index.