Person:
Martinez, Sebastian
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Development economics
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Last updated
January 31, 2023
Biography
Sebastian Martinez is a Principal Economist in the Office of Strategic Planning and Development Effectiveness at the Inter-American Development Bank (IDB). His work focuses on strengthening the evidence base and development effectiveness of the social and infrastructure sectors, including health, social protection, labor markets, water and sanitation and housing and urban development. Sebastian heads a team of economists who conduct research on the impacts of development programs and policies, support the implementation of impact evaluations for Bank operations, and conduct capacity development for clients and staff. Prior to joining the IDB, he spent six years at the World Bank leading evaluations of social programs in Latin America and Africa. Sebastian holds a Ph.D. in Economics from the University of California at Berkeley, with a specialization in development and applied microeconomics.
Publication Search Results
1 - 9 of 9
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Housing, Health, and Happiness
(World Bank, Washington, DC, 2007-04)Despite the importance of housing for people's well-being, there has been little work done to assess the causal impact of housing and housing improvement programs on health and welfare. In this paper the authors help fill this gap by investigating the impact of a large-scale effort by the Mexican government to replace dirt floors with cement floors on child health and adult happiness. They find that replacing dirt floors with cement floors significantly reduces parasitic infestations in young children, reduces diarrhea, reduces anemia, and improves cognitive development. Finally, they also find that this program leave adults substantially better off, as measured by satisfaction with their housing and quality of life and by their significantly lower rates of depression and perceived stress. -
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Investing Cash Transfers to Raise Long-Term Living Standards
(World Bank, Washington, DC, 2006-08)The authors test whether poor households use cash transfers to invest in income generating activities that they otherwise would not have been able to do. Using data from a controlled randomized experiment, they find that transfers from the Oportunidades program to households in rural Mexico resulted in increased investment in micro-enterprise and agricultural activities. For each peso transferred, beneficiary households used 88 cents to purchase consumption goods and services, and invested the rest. The investments improved the household's ability to generate income with an estimated rate of return of 17.55 percent, suggesting that these households were both liquidity and credit constrained. By investing transfers to raise income, beneficiary households were able to increase their consumption by 34 percent after five and a half years in the program. The results suggest that cash transfers to the poor may raise long-term living standards, which are maintained after program benefits end. -
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Rewarding Provider Performance to Enable a Healthy Start to Life : Evidence from Argentina's Plan Nacer
(World Bank, Washington, DC, 2014-05)Argentina's Plan Nacer provides insurance for maternal and child health care to uninsured families. The program allocates funding to provinces based on enrollment of beneficiaries and adds performance incentives based on indicators of the use and quality of maternal and child health care services and health outcomes. The provinces use these resources to pay health facilities to provide maternal and child health care services to beneficiaries. This paper analyzes the impact of Plan Nacer on birth outcomes. The analysis uses data from the universe of birth records in seven Argentine provinces for 2004 to 2008 and exploits the geographic phasing in of Plan Nacer over time. The paper finds that the program increases the use and quality of prenatal care as measured by the number of visits and the probability of receiving a tetanus vaccine. Beneficiaries' probability of low birth-weight is estimated to be reduced by 19 percent. Beneficiaries have a 74 percent lower chance of in-hospital neonatal mortality in larger facilities and approximately half this reduction comes from preventing low birth weight and half from better postnatal care. The analysis finds that the cost of saving a disability-adjusted life year through the program was $814, which is highly cost-effective compared with Argentina's $6,075 gross domestic product per capita over this period. Although there are small negative spillover effects on prenatal care utilization of non-beneficiary populations in clinics covered by Plan Nacer, no spillover is found on their birth outcomes. -
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Promoting Handwashing and Sanitation : Evidence from a Large-Scale Randomized Trial in Rural Tanzania
(World Bank Group, Washington, DC, 2015-01)The association between hygiene, sanitation, and health is well documented, yet thousands of children die each year from exposure to contaminated fecal matter. At the same time, evidence on the effectiveness of at-scale behavior change interventions to improve sanitation and hygiene practices is limited. This paper presents the results of two large-scale, government-led handwashing and sanitation promotion campaigns in rural Tanzania. For the campaign, 181 wards were randomly assigned to receive sanitation promotion, handwashing promotion, both interventions together, or neither. One year after the end of the program, sanitation wards increased latrine construction rates from 38.6 to 51 percent and reduced regular open defecation from 23.1 to 11.1 percent. Households in handwashing wards show marginal improvements in handwashing behavior related to food preparation, but not at other critical junctures. Limited interaction is observed between handwashing and sanitation on intermediate outcomes: wards that received both handwashing and sanitation promotion are less likely to have feces visible around their latrine and more likely to have a handwashing station close to their latrine facility relative to individual treatment groups. Final health effects on child health measured through diarrhea, anemia, stunting, and wasting are absent in the single-intervention groups. The combined-treatment group produces statistically detectable, but biologically insignificant and inconsistent, health impacts. The results highlight the importance of focusing on intermediate outcomes of take-up and behavior change as a critical first step in large-scale programs before realizing the changes in health that sanitation and hygiene interventions aim to deliver. -
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Employment Generation in Rural Africa: Mid-Term Results from an Experimental Evaluation of the Youth Opportunities Program in Northern Uganda
(World Bank, Washington, DC, 2011-12)Can cash transfers promote employment and reduce poverty in rural Africa? Will lower youth unemployment and poverty reduce the risk of social instability? The authors experimentally evaluate one of Uganda's largest development programs, which provided thousands of young people nearly unconditional, unsupervised cash transfers to pay for vocational training, tools, and business start-up costs. Mid-term results after two years suggest four main findings. First, despite a lack of central monitoring and accountability, most youth invest the transfer in vocational skills and tools. Second, the economic impacts of the transfer are large: hours of non-household employment double and cash earnings increase by nearly 50 percent relative to the control group. The authors estimate the transfer yields a real annual return on capital of 35 percent on average. Third, the evidence suggests that poor access to credit is a major reason youth cannot start these vocations in the absence of aid. Much of the heterogeneity in impacts is unexplained, however, and is unrelated to conventional economic measures of ability, suggesting we have much to learn about the determinants of entrepreneurship. Finally, these economic gains result in modest improvements in social stability. Measures of social cohesion and community support improve mildly, by roughly 5 to 10 percent, especially among males, most likely because the youth becomes a net giver rather than a net taker in his kin and community network. Most strikingly, we see a 50 percent fall in interpersonal aggression and disputes among males, but a 50 percent increase among females. Neither change seems related to economic performance nor does social cohesion a puzzle to be explored in the next phase of the study. These results suggest that increasing access to credit and capital could stimulate employment growth in rural Africa. In particular, unconditional and unsupervised cash transfers may be a more effective and cost-efficient forming of large-scale aid than commonly believed. A second stage of data collection in 2012 will collect longitudinal economic impacts, additional data on political violence and behavior, and explore alternative theoretical mechanisms. -
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Preschool and Child Development under Extreme Poverty: Evidence from a Randomized Experiment in Rural Mozambique
(World Bank, Washington, DC, 2017-12)This study analyzed the impact of a community-based preschool program on child development and schooling outcomes in high-poverty areas of rural Mozambique. Preschools were randomly assigned to 30 of 76 eligible communities. Using a panel survey of 2,000 households with preschool aged children, the study found that children who attended preschool experienced gains in cognitive development, communication, fine motor skills, and socio-emotional skills, scoring 0.33 standard deviations higher on a child development screening test. Preschoolers were 21 percentage points more likely to be enrolled in primary school, 14.9 percentage points more likely to enroll at the appropriate age, and had higher cognitive and communication scores in first grade. Treatment effects were generally larger for children from vulnerable households, those with higher initial development levels, and those with longer exposure to treatment. The preschool intervention also generated positive spillovers by increasing the school enrollment of older siblings and labor supply of adult caregivers. At a cost of approximately $3 per child per month, community-led preschools have the potential to be a cost-effective policy option for helping children meet their development potential even in the most resource deprived parts of the world. -
Publication
Impact Evaluation in Practice, First Edition
(World Bank, 2011)The Impact Evaluation in Practice handbook is a comprehensive and accessible introduction to impact evaluation for policymakers and development practitioners. The book incorporates real-world examples to present practical guidelines for designing and implementing evaluations. Readers will gain an understanding of the uses of impact evaluation and the best ways to use evaluations to design policies and programs that are based on evidence of what works most effectively. The handbook is divided into three sections: Part One discusses what to evaluate and why; Part Two outlines the theoretical underpinnings of impact evaluation; and Part Three examines how to implement an evaluation. Case studies illustrate different methods for carrying out impact evaluations. -
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Housing, Health, and Happiness
( 2009)We investigate the impact of a large-scale Mexican program to replace dirt floors with cement floors on child health and adult happiness. We find that replacing dirt floors with cement significantly improves the health of young children measured by decreases in the incidence of parasitic infestations, diarrhea, and the prevalence of anemia, and an improvement in children's cognitive development. Additionally, we find significant improvements in adult welfare measured by increased satisfaction with their housing and quality of life, as well as by lower scores on depression and perceived stress scales. -
Publication
Impact Evaluation in Practice, Second Edition
(Washington, DC: Inter-American Development Bank and World Bank, 2016-09-13)The second edition of the Impact Evaluation in Practice handbook is a comprehensive and accessible introduction to impact evaluation for policy makers and development practitioners. First published in 2011, it has been used widely across the development and academic communities. The book incorporates real-world examples to present practical guidelines for designing and implementing impact evaluations. Readers will gain an understanding of impact evaluations and the best ways to use them to design evidence-based policies and programs. The updated version covers the newest techniques for evaluating programs and includes state-of-the-art implementation advice, as well as an expanded set of examples and case studies that draw on recent development challenges. It also includes new material on research ethics and partnerships to conduct impact evaluation. The handbook is divided into four sections: Part One discusses what to evaluate and why; Part Two presents the main impact evaluation methods; Part Three addresses how to manage impact evaluations; Part Four reviews impact evaluation sampling and data collection. Case studies illustrate different applications of impact evaluations. The book links to complementary instructional material available online, including an applied case as well as questions and answers. The updated second edition will be a valuable resource for the international development community, universities, and policy makers looking to build better evidence around what works in development.