慶応義塾大学法学部のゼミナール「伊東乾民事訴訟法研究会」の卒業生の会「乾会」による論文集。今回はテーマを民事訴訟法に限ることなく、現在関心を持っている法律分野について執筆した。.

I CATEGORIES AND PRINCIPLES ii Introductory Remarks The value of linguistics as a cognitive science lies largely in its potential for providing insights ...

This paper provides an alternative proof of the Gibbard–Satterthwaite theorem.

The Trends in International Mathematics and Science Study found that even though children from all East Asian countries outperformed American children, American students reported higher self-evaluation of their math and science abilities than did students from East Asian countries such as China, Korea, and Japan (Mullis, Martin, Gonzalez, & Chrostowski, 2004). Such cross-cultural differences in self-appraisal fit the stereotype of the modest East Asian and contribute to the received view that East Asians have less positive self-concepts than Americans. This view (...) was summarized recently by Heine, Lehman, Markus, and Kitayama (1999) as follows: ‘‘The need for positive self-regard, as it is currently conceptualized, is not a universal, but rather is rooted in significant aspects of North American culture’’ (p. 766; but cf. Sedikides, Gaertner, & Vevea. (shrink)

This paper provides two brief proofs of Arrow’s general possibility theorem. The second one is simple and short. Our proofs are inspired by the pioneering work by Inada (Ann. Inst. Stat. Math. 6:115–122, 1954).

-/- This unique book develops an operational approach to preference and rationality as the author employs operators over binary relations to capture the concept of rationality. -/- A preference is a basis of individual behavior and social judgment and is mathematically regarded as a binary relation on the set of alternatives. Traditionally, an individual/social preference is assumed to satisfy completeness and transitivity. However, each of the two conditions is often considered to be too demanding; and then, weaker rationality conditions are (...) introduced by researchers. This book argues that the preference rationality conditions can be captured mathematically by “operators,” which are mappings from the set of operators to itself. This operational approach nests traditional concepts in individual/social decision theory and clarifies the underlying formal structure of preference rationality. -/- The author also applies his approach to welfare economics. The core problem of ‘new welfare economics,’ developed by Kaldor, Hicks, and Samuelson, is the rationality of social preference. In this book the author translates the social criteria proposed by those three economists into operational forms, which provide new insights into welfare economics extending beyond ‘new welfare economics.’ . (shrink)

This paper extends the classical extension theorem established by Edward Szpilrajn (Fundamenta Mathematicae, 16, pp. 386–389, 1930). Szpilrajn's theorem states that every quasi‐ordering has an ordering extension. Because of its usefulness in various themes of economics, it has been applied by many researchers. Important generalizations have been presented by two authors, Kenneth Arrow and Kotaro Suzumura, among others. First, we provide concise proofs of four extension theorems by Szpilrajn, Arrow and Suzumura. We then show an extension of their extension theorems.

「語の意味」とは何か?『類語大辞典』の編集・執筆に関わってきた著者が、「意味の本質」「同義・類義・多義」「意味記述の方法」「辞書と意味記述」の4部に渡って、これまで深めてきた考察を明らかにする、「こと ばの意味」の研究に大きく資する一冊。.

Since Condorcet discovered the voting paradox in the simple majority rule, many scholars have tried to investigate conditions that yield “social-preference cycles”. The paradox can be extended to two main approaches. On the one hand, Kenneth Arrow developed a general framework of social choice theory; on the other hand, direct generalizations of the paradox were offered. The motivation and surface meaning of the two approaches are different, as are the assumed background conditions. In this paper, we investigate the relationship between (...) the two approaches by taking a close look at two works, Ferejohn and Fishburn and Schwartz. (shrink)

In this study, we propose a new direction of research on the axiomatic analysis of approval voting, which is a common democratic decision method. Its novelty is to examine an infinite population setting, which includes an application to intergenerational problems. In particular, we assume that the set of the population is countably infinite. We provide several extensions of the method of approval voting for this setting. As our main result, axiomatic characterizations of the extensions are offered by revealing a direct (...) link between approval voting and the Borda rule. The characterized methods are natural extensions of the standard approval voting method for the finite-population case and are regarded as minimum requirements for other possible infinite-population extensions, which are reasonably democratic. (shrink)

This paper examines collective decision-making with an infinite-time horizon setting. First, we establish a result on the collection of decisive sets: if there are at least four alternatives and Arrow’s axioms are satisfied on the selfish domain, then the collection of decisive sets forms an ultrafilter. Second, we impose generalized versions of stationarity axiom for social preferences, which are substantially weaker than the standard version. We show that if any of our generalized versions are satisfied in addition to Arrow’s axioms, (...) then some generation is dictatorial. Moreover, we specify a very weak stationarity axiom that guarantees a possibility result. (shrink)

This paper considers the trade-off between unanimity and anonymity in collective decision-making with an infinite population. This efficiency-equity trade-off is a fundamental difficulty in making a normative judgment in a conflict between generations. In particular, it is known that this trade-off is quite sensitive in the formulation of unanimity axioms. In this study, we consider the trade-off in a preference-aggregation framework instead of the standard utility-aggregation framework. We show that there exists a social welfare function that satisfies I-strong Pareto, independence (...) of irrelevant alternatives, and finite anonymity. This contrasts with an impossibility result in the standard utility-aggregation framework, and this means that the trade-off is also sensitive for background frameworks of aggregations. (shrink)

L’imposition est l’un des principaux sujets de la théorie de la propriété des droits, mais il a pourtant été assez négligé jusque récemment. La communauté académique des philosophes avance de nos jours des arguments pour discuter avec ardeur des types d’imposition qui sont légitimes, s’il en est, et l’on doit beaucoup en ce domaine à l’ouvrage de Liam Murphy et Thomas Nagel The Myth of Ownership. Dans leur ouvrage polémique, les auteurs soutiennent qu’il n’existe pas de droit légitime permettant d’imposer (...) par préemption ni la propriété ni les droits naturels à la propriété et que le processus d’imposition n’empiète certes jamais sur les droits de propriété, qui sont le fruit d’une institution par décret gouvernemental. Murphy et Nagel prennent pour cible principale Richard Epstein qui prône une vue libertarienne ou « libérale classique » contraire à ce propos. Epstein compare l’imposition à une expropriation publique et argumente en faveur de l’impôt sur le revenu. Nous discutons ici la thèse d’Epstein sur la propriété privée, avec laquelle nous nous trouvons en accord quoique moyennant des nuances notables. Nous examinons la théorie étatiste de la propriété de Murphy et Nagel et nous soutenons que leur égalitarisme est surtout le fait d’un présupposé. Nous concluons que l’impôt sur la propriété foncière est la forme d’imposition la plus apte à être légitimée à partir de la perspective libertarienne sur les droits naturels, plus en tous cas que l’impôt sur le revenu et que la taxe sur la valeur ajoutée, formes d’impôt qui sont les plus habituelles. Surtout, nous soutenons qu’il y a là une forme d’imposition que la Constitution du Japon autorise. (shrink)

The aim of the present paper is to provide an axiomatic analysis of incomplete social judgments. In particular, we clarify the underlying power structure of Arrovian collective choice rules when social preferences are allowed to be incomplete. We propose the concept of quasi-decisiveness and investigate the properties of the collection of quasi-decisive sets associated with an Arrovian collective choice rule. In the course of this, we offer a series of applications.

いかなる方向に臨めば日本が文化的小児病から脱することができるのか、そしてその果てに日本文明の成熟をすら望みうるのか(「西欧の自己懐疑と日本の自己放棄」より)―保守的自由主義の源流、エドマンド・バーク、 「大衆」に関して、それを「奇怪」なる存在と捉えていたキルケゴール、民主主義批判をしたニーチェ...など十五人の思想家たちの言説を、私たちが今を生き抜くための精神的な糧にしようとする画期的な書、待望の文 庫化。.

This paper proposes a sufficientarian theory with an interval of sufficiency levels. I assume that there are upper and lower bounds of sufficiency and that all well-being levels in between can be considered sufficiency levels. This interval reflects the vagueness of the concept of sufficiency. According to the proposed principle, a distribution is morally better than another if and only if, for each threshold within the interval, the headcount of those below the threshold under the former distribution is smaller than (...) that under the latter distribution. This necessarily leads to incommensurability in moral relations. I argue that such incommensurability makes sufficientarian principles invulnerable to some fundamental objections. (shrink)

The purpose of this paper is to investigate the relationship between collective rationality and permissible collective choice rules using a unified approach inspired by Bossert and Suzumura (J Econ Theory 138:311–320, 2008). We consider collective choice rules satisfying four axioms: unrestricted domain, strong Pareto, anonymity, and neutrality. A number of new classes of collective choice rules as well as the Pareto and Pareto extension rules are characterized under various concepts of collective rationality: acyclicity, transitivity, quasi-transitivity, semi-transitivity, and the interval order (...) property. Further, new concepts of collective rationality, K-term acyclicity and K-term consistency, are proposed and the corresponding characterizations are provided. (shrink)

Suzumura consistency is a necessary and sufficient condition for the existence of a weak-order extension. This paper provides some remarks on collective choice rules that generate Suzumura consistent social preferences. We examine the properties of such collective choice rules by introducing a procedural condition on collective choice rules. As applications of the procedural condition, we first investigate the decisive structure of a Paretian collective choice rule, and then consider the assignment of individual rights. In our analysis, the concept of semi-decisiveness (...) works effectively. (shrink)