Alchian的定义（续1） 。 关于“产权的强度” property right's strength) -.is measured by its probability and costs of enforcement -.depend on the government,informal social actions,and prevailing ethical and normal norms ->"socially enforced right" 8 Alchian 的定义(续1） • 关于“产权的强度” （property right’s strength) – .is measured by its probability and costs of enforcement – .depend on the government, informal social actions, and prevailing ethical and normal norms – > “socially enforced right