A Study on Social Decision-Making

本研究的目的是根据前一部分的研究，审查一致的社会决策的可能性，并找到评价真实的世界中的政策决策的方法。1）社会选择理论的综述与扩展回顾阿罗之后的社会选择理论，可以说对领域限制和价值限制在理论中的含义的考察是重要的，从这个角度出发，本研究全面综述了关于领域限制和价值限制的争论，关注它如何有助于保证社会选择的一致性。作为本研究的一个应用，研究发现，如果注意并承认每个个体的偏好是基于资源分配的，社会对资源分配的评价是基于其中隐含的收入分配，并根据其水平和平等/不平等进行评价。2）公共选择理论的调查和完善由于公共选择理论以各种形式扩展，本研究从论证的结构特征、论证的方法和分析的对象等方面进行了较为全面的考察。3）公共物品供给制度与社会资本研究本研究拓展了公共物品私人供给与扭曲的公共投资规则中决策的制度特征与公共物品有效供给、社会资本之间关系的分析。

The purpose of the study was in examining the possibility of a consistent social decision-making and in finding way of evaluation of policy decision-making in real worlds in the light of the former part of study. This study performed the following research and obtained the results as in the following :1) Surveys and extensions of social choice theoryA review of social choice theory after Arrow may say that examination of the implication of domain-restriction and value restriction in the theory is important.From this viewpoint this study surveyed comprehensively arguments that treats domain and value restriction paying attention on how it contributes to assure consistent social choice. As an application of this study, the research found that the simple majority rule can provide a consistent social choice if it is noted and admitted that preference of every individual is based on resource allocation, social evaluation of a resource allocation is based on income distribution implied in it, and it is evaluated in terms of its level and equality/inequality.2) Surveys and refinement of public choice theorySince public choice theory is extended in a variety of forms, this study focused on a most comprehensive survey paying attention on structural feature of the arguments, method of arguments and subjects of analyses. It refined the arguments how the theory is further reorganized so that it contributes systemic evaluation of policy decision-making.3) Study of institution for provision of public goods and social-overhead capitalThis study extended the analysis of relationship between institutional feature of decision-making and efficient provision of public goods and social capital concerning private provision of public goods and public investment rule with distortion.