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This paper presents a survey of recent research on the economics of infrastructure in developing countries. Energy, transport, telecommunications, water and sanitation are considered. The survey covers two main set of issues: the linkages between infrastructure and economic growth (at the economy-wide, regional and sectoral level) and the composition, sequencing and efficiency of alternative infrastructure investments, including the arbitrage between new investments and maintenance expenditures; OPEX and CAPEX, and public versus private investment. Following the introduction, section 2 discusses the theoretical foundations (growth theory and new economic geography). Section 3 assesses the analysis of 140 specifications from 64 recent empirical papers-examining type of data used, level of aggregation, econometric techniques and nature of the sample-and discusses both the macro-econometric and micro-econometric contributions of these papers. Finally section 4 discusses directions for future research and suggests priorities in data development.

Efficiency of Infrastructure --- Externalities --- Infrastructure Development --- Infrastructure Investment --- Railroad --- Road --- Road Quality --- Sanitation --- Transport --- Transport Data --- Transport Economics, Policy and Planning

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The poor state of Cameroon's infrastructure is a key bottleneck to the nation's economic growth. From 2000 to 2005, improvements in information and communications technology (ICT) boosted Cameroon's growth performance by 1.26 percentage points per capita, while deficient power infrastructure held growth back by 0.28 points per capita. If Cameroon could improve its infrastructure to the level of Africa's middle-income countries, it could raise its per capita economic growth rate by about 3.3 percentage points. Cameroon has made significant progress in many aspects of infrastructure, implementing institutional reforms across a broad range of sectors with a view to attracting private-sector participation and finance, which has generally led to performance improvements. But the country still faces a number of important infrastructure challenges, including poor road quality, expensive and unreliable electricity, and a stagnating and uncompetitive ICT sector. Cameroon currently spends around USD 930 million per year on infrastructure, with USD 586 million lost to inefficiencies. Removing those inefficiencies would leave an infrastructure funding gap of USD 350 million per year. Given Cameroon's relatively strong economy and natural-resource base, as well as its success in attracting private financing, the country should be able to close that gap and meet its infrastructure goals within 13 years.

Banks & Banking Reform --- Energy Production and Transportation --- Growth performance --- Information and communications technology --- Infrastructure Economics --- Infrastructure Economics and Finance --- Macroeconomics and Economic Growth --- Per capita economic growth --- Performance improvements --- Road quality --- Town Water Supply and Sanitation --- Transport Economics Policy & Planning

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The authors present a new database of minimum distance road routes connecting 138 cities in 27 countries across Europe and Central Asia. They use it to show that improved road network quality is robustly associated with higher intraregional trade flows. Gravity model simulations suggest that an ambitious but feasible road upgrade could increase trade by 50 percent over baseline, exceeding the expected gains from tariff reductions or trade facilitation programs of comparable scope. Cross-country spillovers due to overland transit are important: total intraregional trade could be increased by 30 percent by upgrading roads in just three countries-Albania, Hungary, and Romania.

Bottlenecks --- Costs --- High Transport --- Initiatives --- Investments --- Road --- Road Improvement --- Road Infrastructure --- Road Network --- Road Quality --- Road Transport --- Roads --- Route --- Routes --- Trans Transit Routes --- Transport --- Transport Costs --- Transport Data --- Transport Economics, Policy and Planning --- Travel --- True

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Based on extensive data collection in Uganda, this paper demonstrates that the rural access index, as defined today, should not be a government objective because the benefit of such investment is minimal, whereas achieving rural accessibility at less than 2 kilometers would require massive investments that are not sustainable. Taking into account the fact that plot size is limited on average to less than 1 hectare, a farmer's transport requirement is usually minimal and does not necessarily involve massive investments in infrastructure. This is because most farmers cannot fully load a truck or pay for this service and, even if productivity were to increase significantly, the production threshold would not be reached by most individual farmers. Therefore, in terms of public policy, maintenance of the existing rural roads rather than opening new roads should be given priority; the district feeder road allocation maintenance formula should be revised to take into account economic potential and, finally, policy makers should devote their attention to innovative marketing models from other countries where smallholder loads are consolidated through private-based consolidators.

Access roads --- Accessibility --- Affordable transport --- Means of transport --- Mode of transport --- Modes of transport --- Population density --- Road --- Road building --- Road conditions --- Road improvement --- Road network --- Road quality --- Roads --- Rural infrastructure --- Rural roads --- Transport --- Transport Economics, Policy and Planning --- Transportation --- Transportation costs --- Travel time

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This study examines the relationship between transport infrastructure and agriculture in Sub-Saharan Africa using new data obtained from geographic information systems (GIS). First, the authors analyze the impact of road connectivity on crop production and choice of technology. Second, they explore the impact of investments that reduce road travel times. Finally, they show how this type of analysis can be used to compare cost-benefit ratios for alternative road investments in terms of agricultural output per dollar invested. The authors find that agricultural production is highly correlated with proximity (as measured by travel time) to urban markets. Likewise, adoption of high-productive/high-input technology is negatively correlated with travel time to urban centers. There is therefore substantial scope for increasing agricultural production in Sub-Saharan Africa, particularly in more remote areas. Total crop production relative to potential production is 45 percent for areas within four hours' travel time from a city of 100,000 people. In contrast, it is just 5 percent for areas more than eight hours away. Low population densities and long travel times to urban centers sharply constrain production. Reducing transport costs and travel times to these areas would expand the feasible market size for these regions. Compared to West Africa, East Africa has lower population density, smaller local markets, lower road connectivity, and lower average crop production per unit area. Unlike in East Africa, reducing travel time does not significantly increase the adoption of high-input/high-yield technology in West Africa. This may be because West Africa already has a relatively well-connected road network.

Accessibility --- Agriculture --- Climate Change and Agriculture --- Connected road network --- Crops & Crop Management Systems --- Crossing --- Economic Theory & Research --- Impact of transport --- Macroeconomics and Economic Growth --- Population densities --- Population density --- Regional Economic Development --- Road --- Road information --- Road infrastructure --- Road quality --- Road type --- Rural roads --- Transport --- Transport costs --- Transport Economics Policy & Planning --- Transport infrastructure --- Travel speed --- Travel speeds --- Travel time --- Travel times