Tính bình quân (AVERAGING) là mua, hoặc bán các cổ phiếu bổ sung của cổ phần nhất định đạt mức giá thấp (bình quân xuống)

The purchase, or sale, of additional shares of a given stock at successively lower (averaging down) or higher (averaging up) prices in order to establish an average price on the total transaction. See Scale order. The holder of 100 shares of a stock at 20, who buys 100 additional shares of the same stock at 10, would thus own 200 shares at an average price of 15. Hence if the stock recovers to 16 he would show a profit. Conversely, anyone selling 100 shares at 20 and an additional 100 shares at 30 would obtain an average price of 25 on the 200 shares. See Buy on scale; Sell on scale.