基于实物期权的 PPP 项目政府担保与收益限制水平决策研究

How to confirm the minimum revenue guarantee and toll revenue cap depends on the relevant experience of decisionmakers in PPP projects. But there is no effective standard because minimum revenue guarantee and toll revenue cap areoften subjective and thus leads to the unreasonable risk distribution in PPP projects. Based on the real option theory and PPP case,this study established a government’s minimum purchase guarantee level model to determine the government minimum purchaseamount in PPP projects,and developed a revenue ceiling model to clarify the corresponding revenue ceiling. The findings arevaluable to the interest distributing and risk sharing of PPP projects,so as to improve the project performance and promote thesuccess of the project.     

PPP项目政府激励与社会资本努力的演化博弈与仿真

在PPP项目中,政府的激励策略是抑制社会资本不努力行为的重要机制。研究建立政府激励策略与社会资本努力行为互动的支付矩阵及动态演化博弈模型,分析双方在决策互动中的复制动态和进化稳定性。研究表明,(不激励,不努力)、(不激励,努力)、(激励,努力)策略在不同的参数设置下均有可能成为稳定策略,且个体决策行为对群体行为决策具有一定的影响。Matlab数值仿真结果显示,当社会资本不努力时,政府方一定不会给予激励;而且政府在激励策略中更加偏好事后奖励的激励方式。因此,政府方应该注重具有弹性的事后奖励带来的激励价值。研究结果为合理地设置PPP项目激励机制提供建议。