A. Sales promotion B. Sales on a commission basis C. Incentive sale D. Return of goods E. Selling off goods at reduced prices F. Bargain day G. Quick sales and small profit H. Sale by bulk I. Unmarketable J. Gross profit K. Sudden huge profit L. Monopoly profit M. Transaction without profit N. Legitimate profit O. Selling on credit P. Auction Q. Dumping R. Net profit ( )滞销 ( )无利交易