世界経済・社会統計 = World development indicators

This paper investigates the role of social learning in the diffusion of a new agri cultural technology in Ghana. We use unique data on farmers' communication patterns to define each individual's information neighborhood. Conditional on many potentially confounding variables, we find evidence that farmers adjust their inputs to align with those of their information neighbors who were surpris ingly successful in previous periods. The relationship of these input adjustments to experience further indicates the presence of social learning. In addition, applying the same method to input choices for another crop, of known technol ogy, correctly indicates an absence of social learning effects. (JEL D83, 013, 033, Q16)

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Learning About a New Technology: Pineapple in Ghana

Jenny Aker and Isaac Mbiti examine the growth of mobile phone technology over the past decade and consider its potential impacts upon quality of life in low-income countries, with a particular focus on sub-Saharan Africa. They first provide an overview of the patterns and determinants of mobile phone coverage in sub-Saharan Africa before describing the characteristics of primary and secondary mobile phone adopters on the continent. They then discuss the channels through which mobile phone technology can impact development outcomes, both as a positive externality of the communication sector and as part of mobile phone-based development projects, and analyze existing evidence. While current research suggests that mobile phone coverage and adoption have had positive impacts on agricultural and labor market efficiency and welfare in certain countries, empirical evidence is still somewhat limited. In addition, mobile phone technology cannot serve as the “silver bullet” for development in sub-Saharan Africa. Careful impact evaluations of mobile phone development projects are required to better understand their impacts upon economic and social outcomes, and mobile phone technology must work in partnership with other public good provision and investment.

Mobile Phones and Economic Development in Africa

The 2013 Human Development Report – "The Rise of the South: Human Progress in a Diverse World" – examines the profound shift in global dynamics driven by the fast-rising new powers of the developing world and its long-term implications for human developmentChina has already overtaken Japan as the world's second biggest economy while lifting hundreds of millions of its people out of poverty India is reshaping its future with new entrepreneurial creativity and social policy innovation Brazil is lifting its living standards through expanding international relationships and antipoverty programs that are emulated worldwideBut the "Rise of the South" analyzed in the Report is a much larger phenomenon: Turkey, Mexico, Thailand, South Africa, Indonesia and many other developing nations are also becoming leading actors on the world stage

Human Development Report 2013. The Rise of the South: Human Progress in a Diverse World

The questionnaires from the field were received, checked and stored by the data processing personnel. They checked: 1. The completeness of the questionnaires 2. The correct bubbling 3. The correct number of questionnaires per household, if total males + total females > 8 as the questionnaire ONLY accommodated maximum of 8 household members. 4. The reference number appears in all the 10 pages of the questionnaires.

Population and Housing Census

We explore the impact of reduced transaction costs on risk sharing by estimating the effects of a mobile money innovation on consumption. In our panel sample, adoption of the innovation increased from 43 to 70 percent. We find that, while shocks reduce consumption by 7 percent for nonusers, the consumption of user households is unaffected. The mechanisms underlying these consumption effects are increases in remittances received and the diversity of senders. We report robustness checks supporting these results and use the four-fold expansion of the mobile money agent network as a source of exogenous variation in access to the innovation. (JEL E42, G22, O16, O17, Z13) In developing countries, informal networks provide an important means by which individuals and households share risk, though the insurance they provide is often incomplete. Economists have proposed a number of reasons for this incompleteness, including information asymmetries, which manifest in problems of moral hazard, and limited commitment, both of which induce positive correlations between realized income and consumption. In this article we emphasize a complementary source of incompleteness: transaction costs—literally, the costs of transferring resources between individuals. We test the impact of transaction costs on risk sharing by analyzing data from a large panel household survey that we designed and administered in Kenya over a three-year period to capture the expansion of “mobile money.” This financial innovation has allowed individuals to transfer purchasing power by simple short messaging service ( SMS) technology and has dramatically reduced the cost of sending money across large distances. Mobile money is a recent innovation in developing economies—one of the first and most successful examples to date is Kenya’s “M-PESA.” 1 In just four years after its

https://www.uh.edu/%7Ebsorense/risk_sharing_and_transactions_costs.pdf

Risk Sharing and Transactions Costs: Evidence from Kenya's Mobile Money Revolution

Mobile money, a service that allows monetary value to be stored on a mobile phone and sent to other users via text messages, has been adopted by the vast majority of Kenyan households. We estimate that access to the Kenyan mobile money system M-PESA increased per capita consumption levels and lifted 194,000 households, or 2% of Kenyan households, out of poverty. The impacts, which are more pronounced for female-headed households, appear to be driven by changes in financial behavior-in particular, increased financial resilience and saving-and labor market outcomes, such as occupational choice, especially for women, who moved out of agriculture and into business. Mobile money has therefore increased the efficiency of the allocation of consumption over time while allowing a more efficient allocation of labor, resulting in a meaningful reduction of poverty in Kenya.

https://science.sciencemag.org/content/sci/354/6317/1288.full.pdf

The long-run poverty and gender impacts of mobile money.

Mobile money is a tool that allows individuals to make financial transactions using cell phone technology. In this paper, we report initial results of two rounds of a large survey of households in Kenya, the country that has seen perhaps the most rapid and widespread growth of a mobile money product - known locally as M‐PESA - in the developing world. We first summarize the mechanics of M-PESA, and review its potential economic impacts. We then document the sequencing of adoption across households according to income and wealth, location, gender, and other socio‐economic characteristics, as well as the purposes for which the technology is used, including saving, sending and receiving remittances, and direct purchases of goods and services. In addition, we report findings from a survey of M‐PESA agents, who provide cash‐in and cash‐out services, and highlight the inventory management problems they face.

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Mobile Money: The Economics of M-PESA

This paper investigates an empirical puzzle in technology adoption for developing countries: the low adoption rates of technologies like hybrid maize that increase average farm profits dramatically. I offer a simple explanation for this: benefits and costs of technologies are heterogeneous, so that farmers with low net returns do not adopt the technology. I examine this hypothesis by estimating a correlated random coefficient model of yields and the corresponding distribution of returns to hybrid maize. This distribution indicates that the group of farmers with the highest estimated gross returns does not use hybrid, but their returns are correlated with high costs of acquiring the technology (due to poor infrastructure). Another group of farmers has lower returns and adopts, while the marginal farmers have zero returns and switch in and out of use over the sample period. Overall, adoption decisions appear to be rational and well explained by (observed and unobserved) variation in heterogeneous net benefits to the technology.

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Selection and comparative advantage in technology adoption

Urban populations have skyrocketed globally and today represent more than rban populations have skyrocketed globally and today represent more than half of the world’s population. In some parts of the developing world, this half of the world’s population. In some parts of the developing world, this growth has more-than-proportionately involved rural migration to informal growth has more-than-proportionately involved rural migration to informal settlements in and around cities, known more commonly as “slums”— densely settlements in and around cities, known more commonly as “slums”— densely populated urban areas characterized by poor-quality housing, a lack of adequate living populated urban areas characterized by poor-quality housing, a lack of adequate living space and public services, and accommodating large numbers of informal residents space and public services, and accommodating large numbers of informal residents with generally insecure tenure.

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Tavneet Suri

Papers

Risk Sharing and Transactions Costs: Evidence from Kenya's Mobile Money Revolution

The long-run poverty and gender impacts of mobile money.

Mobile Money: The Economics of M-PESA

Selection and comparative advantage in technology adoption

The Economics of Slums in the Developing World