== Abstract ==

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Transport infrastructure is deemed to be             central to development and consumes a large fraction of the             development assistance envelope. Yet there is debate about             the economic impact of road projects. This paper proposes an             approach to assess the differential development impacts of             alternative road construction and prioritize various             proposals, using Nigeria as a case study. Recognizing that             there is no perfect measure of economic well-being, a             variety of outcome metrics are used, including crop revenue,             livestock revenue, non-agricultural income, the probability             of being multi-dimensionally poor, and local gross domestic             product for Nigeria. Although the measure of transport is             the most accurate possible, it is still endogenous because             of the nonrandom placement of road infrastructure. This             endogeneity is addressed using a seemingly novel             instrumental variable termed the natural path: the time it             would take to walk along the most logical route connecting             two points without taking into account other, bias-causing             economic benefits. Further, the analysis considers the             potential endogeneity from nonrandom placement of households             and markets through carefully chosen control variables. It             finds that reducing transportation costs in Nigeria will             increase crop revenue, non-agricultural income, the wealth             index, and local gross domestic product. Livestock sales             increase as well, although this finding is less robust. The             probability of being multi-dimensionally poor will decrease.             The results also cast light on income diversification and             structural changes that may arise. These findings are robust             to relaxing the exclusion restriction. The paper also             demonstrates how to prioritize alternative road programs by             comparing the expected development impacts of alternative             New Partnership for Africas Development projects.

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Document type: Book

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== Full document ==

<pdf>Media:Ali_et_al_2015b-beopen1713-1361-document.pdf</pdf>

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== Original document ==

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The different versions of the original document can be found in:

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* [http://documents.worldbank.org/curated/en/519511468189240918/pdf/Transport-infrastructure-and-welfare-an-application-to-Nigeria.pdf http://documents.worldbank.org/curated/en/519511468189240918/pdf/Transport-infrastructure-and-welfare-an-application-to-Nigeria.pdf]

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* [http://dx.doi.org/10.1596/1813-9450-7271 http://dx.doi.org/10.1596/1813-9450-7271]

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* [http://hdl.handle.net/10986/22004 http://hdl.handle.net/10986/22004] under the license http://creativecommons.org/licenses/by/3.0/igo/

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* [http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2015/05/18/090224b082e9bb99/2_0/Rendered/PDF/Transport0infr0plication0to0Nigeria.pdf http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2015/05/18/090224b082e9bb99/2_0/Rendered/PDF/Transport0infr0plication0to0Nigeria.pdf]

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* [https://openknowledge.worldbank.org/handle/10986/22004 https://openknowledge.worldbank.org/handle/10986/22004],

: [https://documents.worldbank.org/curated/en/2015/05/24498118/transport-infrastructure-welfare-application-nigeria https://documents.worldbank.org/curated/en/2015/05/24498118/transport-infrastructure-welfare-application-nigeria],

: [https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2607771 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2607771],

: [https://ideas.repec.org/p/wbk/wbrwps/7271.html https://ideas.repec.org/p/wbk/wbrwps/7271.html],

: [https://elibrary.worldbank.org/doi/book/10.1596/1813-9450-7271 https://elibrary.worldbank.org/doi/book/10.1596/1813-9450-7271],

: [https://trid.trb.org/view/1360633 https://trid.trb.org/view/1360633],

: [http://documents.vsemirnyjbank.org/curated/ru/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria http://documents.vsemirnyjbank.org/curated/ru/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria],

: [https://documents.albankaldawli.org/curated/ar/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria https://documents.albankaldawli.org/curated/ar/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria],

: [https://documents.shihang.org/curated/zh/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria https://documents.shihang.org/curated/zh/519511468189240918/Transport-infrastructure-and-welfare-an-application-to-Nigeria],

: [https://papers.ssrn.com/sol3/Delivery.cfm/7271.pdf?abstractid=2607771&mirid=5 https://papers.ssrn.com/sol3/Delivery.cfm/7271.pdf?abstractid=2607771&mirid=5],

: [https://EconPapers.repec.org/RePEc:wbk:wbrwps:7271 https://EconPapers.repec.org/RePEc:wbk:wbrwps:7271],

: [https://academic.microsoft.com/#/detail/1883120136 https://academic.microsoft.com/#/detail/1883120136]

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