斎藤　湧生 （サイトウ　ワクオ）

Saito, Wakuo

写真a

所属（所属キャンパス）

経済学部 （三田）

職名

研究員
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  • Hierarchical Bayesian hedonic regression analysis of Japanese rice wine: is the price right?

    Saito W., Nakatsuma T.

    International Journal of Wine Business Research 35 （ 2 ） 256 - 277 2023年05月

    ISSN  17511062

    　概要を見る

    Purpose: This paper aims to formulate a hedonic pricing model for Japanese rice wine, sake, via hierarchical Bayesian modeling estimated using an efficient Markov chain Monte Carlo (MCMC) method. Using the estimated model, the authors examine how producing regions, rice breeds and taste characteristics affect sake prices. Design/methodology/approach: The datasets in the estimation consist of cross-sectional observations of 403 sake brands, which include sake prices, taste indicators, premium categories, rice breeds and regional dummy variables. Data were retrieved from Rakuten, Japan’s largest online shopping site. The authors used the Bayesian estimation of the hedonic pricing model and used an ancillarity–sufficiency interweaving strategy to improve the sampling efficiency of MCMC. Findings: The estimation results indicate that Japanese consumers value sweeter sake more, and the price of sake reflects the cost of rice preprocessing only for the most-expensive category of sake. No distinctive differences were identified among rice breeds or producing regions in the hedonic pricing model. Originality/value: To the best of the authors’ knowledge, this study is the first to estimate a hedonic pricing model of sake, despite the rich literature on alcoholic beverages. The findings may contribute new insights into consumer preference and proper pricing for sake breweries and distributors venturing into the e-commerce market.

  • Lower Alertness entails More Cooperation: Evidence from Prisoner's Dilemma and Coordination Games

    Kokubo T., Kon N., Kurino M., Saito W., Shimada N., Yanagisawa M.

    Proceedings - 2023 IEEE International Conference on Big Data, BigData 2023    3185 - 3193 2023年

    　概要を見る

    We report an experiment on the relationship between sleep and cooperative behavior by using Electroencephalogram (EEG) measuring devices and Psychomotor Vigilance Test (PVT) in measuring subjects' alertness. In this experiment, two types of games - prisoner's dilemmas and coordination games - were conducted by controlling subjects' sleep. We found that lower alertness measured by PVT entails more cooperation in both games. On the other hand, we did not observe a significant relationship between sleeping time and cooperation.

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