影响我国农村土地产权制度中契约水平的主要因素是契约主体的垄断偏好。
China's public enterprises appear double long-term features of market operation and regulation, which has natural monopoly nature as well as the main character of administrative body.我国的公用企业长期具有市场经营与行业管理的双重特征,既具有自然垄断的性质又具有行政主体的性质。