北京允许优质工程加价出售北京市有关部门将制定《履约保证金制度》与《工程建设优质优价政策》等工程质量经济机制，减少建筑市场的行政管理手段，提高企业参与市场竞争的自觉性。《履约保证金制度》规定，承包商必须提供履约保证、投标保证、支付保证等，以确保合同规定的质 Beijing allows quality projects to be sold at higher prices. The relevant Beijing municipal authorities will formulate “project performance guarantee system” and “project construction quality and price policy” and other project quality economic mechanisms to reduce the administrative measures of the construction market and increase the awareness of enterprises participating in market competition. The “performance bond system” stipulates that the contractor must provide performance guarantees, bid guarantees, payment guarantees, etc. to ensure the quality of the contract.