bargainn.交易；便宜货；契约v.讨价还价；议价；(谈价钱后)卖bargain center平价市场bargain theory谈判决定工资论bargaining set谈判集bargain hunter到处寻找便宜货的人bargain-price处理价格bargaining cost谈判成本bargain-penny定金bargaining unit谈判单位bargain quantum成交量bargaining game讨价还价博弈