Yamada, Hiroyuki

写真a

Affiliation

Faculty of Economics ( Mita )

Position

Professor

Related Websites
Scopus Paper Info  
Paper Count: 60 Citation Count: 491 h-index: 11

Click to view the Scopus page. The data was downloaded from Scopus API in March 15, 2026, via http://api.elsevier.com and http://www.scopus.com .

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Papers 【 Display / hide 】

  • Impacts of Improved Rural Roads on the Well-Being of Cambodian Villagers

    Vu T.M., Yamada H.

    Review of Development Economics 30 ( 1 ) 78 - 90 2026.02

    ISSN  13636669

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    We examine the impacts of improved rural roads on villagers, using panel data of Cambodian villages (2006–2021). We apply econometric methods to deal with multiple treatment timings and multiple time periods in an event study. We find an association between the wealth of villagers and the improvement of rural roads. A higher minimum price for rice at the farm gate may be one of the reasons for the increase in wealth. We also find impacts of improved rural roads on (reducing) illiteracy rates among villagers. However, we do not find any statistically significant impacts on the school enrollment rate, structural change, or internal migration. Instead, improved rural roads lead to a higher share of families being subjected to environmental pollution. Our findings suggest that policymakers should have cautious expectations regarding the feasible impacts of improved rural roads.

  • The impact of terminating universal primary education on fertility: Evidence from Kenya

    Wakano A., Yamada H.

    International Journal of Educational Development 117 2025.09

    ISSN  07380593

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    This paper investigates the educational impact on fertility caused by the termination of universal primary education (UPE) in Kenya. Although previous studies have used the introduction of UPE as a natural experiment, we focus on a unique policy change, namely, the termination of UPE. By using six waves of the Kenya Demographic and Health Survey (KDHS), our paper presents the statistically significant discontinuity in female years of education at the termination of UPE. The termination of UPE led to a decrease of 0.57 years in of female education. Using a fuzzy regression discontinuity design, we identify the impacts of education on both onset of fertility and total fertility. One additional year of female education delays onset of fertility by 0.67 years and reduces total fertility by 0.21 fewer children by the age of 46 years. As for the mechanism of these changes, we explore three possible pathways: labor participation, knowledge of contraception, and assortative mating.

  • Cervical, Breast, and Colorectal Cancer Screening Rates Among Sexual and Gender Minority Women in Japan: Using a Nationwide Online Survey

    Matsushima M., Wang J., Minami T., Yamada H., Kondo N., Tabuchi T.

    Health Science Reports 8 ( 8 )  2025.08

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    Background and Aims: Owing to the high mortality rates associated with cervical and breast cancers, increasing screening uptake is a priority. However, the current policy lacks consideration for sexual and gender minorities (SGMs). This study aimed to examine whether SGM women have lower take-up rates of these female-organ-specific cancers than non-SGM women by investigating the difference in screening frequency between them. Additionally, colorectal cancer screening was used as another outcome to determine whether the results were unique to female-organ-specific cancers. Methods: This cross-sectional study was conducted using a nationwide online survey in 2023. Information from women aged 20–69 years was used, with a sample size of 12,305, including 1371 SGM and 10,934 non-SGM individuals. As an outcome variable, the careening take-up of cervical and breast cancers was used, sex-specific cancer and being screened in Obstetrics and Gynecology, colorectal cancer, which is non-sex specific, and the screening is conducted at home. Results: Considering demographic characteristics and socioeconomic status as constants, a lower likelihood of screening for cervical and breast cancer was observed in SGM women than in non-SGM women (odds ratio [OR] 0.78; 95% confidence interval [CI] 0.69–0.88 for cervical cancer, and OR 0.77; 95% CI 0.64–0.93 for breast cancer). No difference was found between SGM and non-SGM women in colorectal cancer screening (OR 0.96; 95% CI 0.80–1.16). Conclusion: This study highlights the sexual orientation and gender identity gap in the frequency of cervical and breast cancer screenings but not in colorectal cancer screenings. This study highlights the potential barriers faced by SGM women, emphasizing the importance of raising awareness of the unique healthcare challenges, particularly concerning female-organ-specific cancers.

  • The impact of computer science education in primary schools: Evidence from a randomized controlled trial in Iraq

    Shimizutani S., Taguchi S., Yamada H.

    Plos One 20 ( 5 May )  2025.05

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    With the growing digitization of society, there is a need to enhance computational thinking as an indispensable skill for modern daily life. Consequently, computer science education for children at early ages has become increasingly important. This study conducts a randomized controlled trial to examine the impact of the interventions using educational robotics as well as computer-aided mathematics drills (via a “math app”) on students' performance in primary schools in Basra, Iraq. We provide several new empirical findings. First, the short-run impact of robotics-based learning on computational thinking is positive and statistically significant for girls, particularly poor performing girls, but not for boys. Second, the impact on computational thinking is augmented by introducing a math app, further improving computational thinking. Together, these two interventions also enhance general intelligence. Third, the positive impact was still evident more than three months after the interventions for girls who received both computer science and math education, suggesting their complementarity. Our results show that computer science education using educational robots in primary schools is effective in enhancing computational thinking and relevant skills.

  • Gender, social networks, and the use of organic fertilizers toward sustainable agriculture in suburban villages of Central Vietnam

    Le T.Q.A., Shimamura Y., Yamada H., Le M.D.

    Sustainable Development 33 ( 1 ) 1401 - 1416 2025.02

    ISSN  09680802

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    Farmland degradation caused by excessive use of agrochemicals is a serious environmental concern, and thus the use of organic fertilizers is encouraged for sustainable agriculture in Vietnam. However, the adoption of organic fertilizers among farming households has been slow, spontaneous, and fragmented. The absence of credible information and advisory sources is reported to be a critical constraint. The sharing of information and experiences among social networks is expected to play an important role in overcoming this constraint, although strong causal evidence remains scarce. Therefore, this study employs an instrumental variable approach with observational village-census data to identify the causal impacts of social networks on the adoption of organic fertilizers and explores the underlying information-sharing mechanism within social networks, providing rich information about existing social networks for both men and women separately. The estimation results show that in farming households, the wife's social networks have a positive and significant effect on the diffusion of organic fertilizers. Our findings highlight the role of information exchange, experience sharing, and agricultural collaboration among groups of women in enhancing pro-environmental agricultural practices in suburban villages of Central Vietnam.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • アフリカにおけるNGO－アカデミア協働の経済学：マダガスカルのトイレプロジェクト

    2023.04
    -
    2027.03

    基盤研究(B), Principal investigator

  • Development Econometrics Rooted in Historical and Cultural Factors

    2022.06
    -
    2025.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, 挑戦的研究（萌芽）, Principal investigator

  • 地理空間情報科学をいかに開発経済学に融合出来るか

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • Globalization and its influences on domestic economies: evidences using firm and plant level data in Vietnam and Japan

    2013.04
    -
    2017.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Principal investigator

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    Using the officially collected enterprise-level data in Vietnam, I conducted empirical research to capture the dynamic structural changes in economy and society of the country. Where it is possible, I attempted to use a panel data constructed from the original data. Concretely, I studied (1) factors associating with the survival of multinational enterprises (MNE) in Vietnam during 2000-2011 using Cox hazard models, (2) how the origin of foreign investors affects the degree of horizontal and vertical technological spillovers, and (3) the impacts of health insurance coverage on medium and large-scale domestic private firms’ performance and productivity. Regarding the effect of import penetration on domestic employment, which is an important topic for both developing and developed countries, I studied using the plant-level panel data in Japan as well as the Vietnamese data mentioned above.

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Courses Taught 【 Display / hide 】

  • TOPICS IN APPLIED ECONOMICS AND POLICY

    2025

  • SEMINAR: INTERNATIONAL ECONOMICS

    2025

  • RESEARCH SEMINAR D

    2025

  • RESEARCH SEMINAR C

    2025

  • RESEARCH SEMINAR B

    2025

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