異時点間選択と消費・貯蓄、退職行動

在与池田教授合作研究的《感恩父母利他主义与S子女习惯养成》一文中，我们提出了父母利他与子女习惯养成的关系模型，即儿童从小就不知道自己的养成习惯，只有在成长过程中才意识到。我们发现，利他主义的母亲(I)将转移给孩子的收入保持在低于孩子意愿的水平，并且(Ii)当孩子表现出特定习惯的外源性增加时，会减少进一步的收入转移。如果母亲足够富有且乐于助人，孩子长大后可能会对小规模的收入转移心存感激：根据已实现的习惯性偏好进行评估时，小规模的收入转移会带来比孩子更喜欢的更大的收入转移带来的更大的儿童福利。这意味着，在其他条件相同的情况下，富裕家庭的父母往往会防范子女的挥霍。在另一项联合研究中，我们检验并验证了理论模型中的假设，即意识到习惯的人如果来自富裕家庭，往往会严格养育孩子。利用日本大阪大学偏好参数研究的数据，我们发现，在被调查者意识到习惯的情况下，被调查者严格的教养方式与15岁时的生活水平存在显著的正相关关系。这一实证结果与我们的理论预测相一致。

I accomplished the contents of my theoretical research plan by incorporating habit formation and parental altruism, and investigated the theoretical conclusions by using empirical analysis.In my paper "Thankworthy Parental Altruism and Children' s Habit-Formation" which is based on the joint research with Professor Ikeda, we propose a model of parental altruism in relation with child habit formation, where children are unaware of their developing habits while young, and become cognizant of them only on growing up. We show that an altruistic mother (i) maintains the amount of income transferred to her child lower than the child would desire and (ii) reduces further income transfer upon an exogenous increase in the child's performance of a particular habit. The child, when grown, may end up grateful for the small income transfer if the mother is sufficiently rich and altruistic : when evaluated by the realized habitual preferences, a small income transfer leads to greater child welfare than the greater income transfer preferred by the child would have generated. This implies that parents from richer families, ceteris paribus, tend to guard against their children's profligacy.In another joint research "Strict Parents Come From Wealthy Families : An Empirical Study", We examine and verify the hypothesis from our theoretical model that people who are aware of habit tend to strictly upbring their children if they are from wealthy family. Using the data from "Preference Parameters Study of Osaka University" in Japan, we find that there are significantly positive relations between respondents' strict upbringing practices and their living standards when 15 years old in the case that respondents are aware of habit. This empirical result is consistent with our theoretical prediction.