Publication: An Exploration of the Link between Development, Economic Growth, and Natural Risk
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This paper investigates the link between development, economic growth, and the economic losses from natural disasters in a normative analytical framework with an illustration on hurricane flood risks in New Orleans. It concludes that under broad conditions it is optimal for (1) the probability of disaster occurrence to decrease with income; (2) the capital at risk—and thus the economic losses in case of disaster — to increase faster than economic growth; and (3) the average annual losses to grow faster than income at low levels of development and slower than income at high levels of development. Increasing risk-taking reinforces economic growth; improving protections transfers risks from frequent low-intensity events to rare high-impact events.
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“Hallegatte, Stéphane. 2013. An Exploration of the Link between Development, Economic Growth, and Natural Risk. © World Bank. http://hdl.handle.net/10986/16372 License: CC BY 3.0 IGO.”
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Publication An Exploration of the Link between Development, Economic Growth, and Natural Risk(World Bank, Washington, DC, 2012-10)This paper investigates the link between development, economic growth, and the economic losses from natural disasters in a general analytical framework, with an application to hurricane flood risks in New Orleans. It concludes that where capital accumulates through increased density of capital at risk in a given area, and the costs of protection therefore increase more slowly than capital at risk, (i) protection improves over time and the probability of disaster occurrence decreases; (ii) capital at risk -- and thus economic losses in case of disaster -- increases faster than economic growth; (iii) increased risk-taking reinforces economic growth. In this context, average annual losses from disasters grow with income, and they grow faster than income at low levels of development and slower than income at high levels of development. These findings are robust to a broad range of modeling choices and parameter values, and to the inclusion of risk aversion. They show that risk-taking is both a driver and a consequence of economic development, and that the world is very likely to experience fewer but more costly disasters in the future. It is therefore critical to increase economic resilience through the development of stronger recovery and reconstruction support instruments.Publication The Indirect Cost of Natural Disasters and an Economic Definition of Macroeconomic Resilience(World Bank, Washington, DC, 2015-07)The welfare impact of a disaster does not depend only on the physical characteristics of the event or its direct impacts in terms of lost lives and assets. Depending on the ability of the economy to cope, recover, and reconstruct, the reconstruction will be more or less difficult, and the welfare effects smaller or larger. This ability, which can be referred to as the macroeconomic resilience of the economy to natural disasters, is an important parameter to estimate the overall vulnerability of a population. Here, resilience is decomposed into two components: instantaneous resilience, which is the ability to limit the magnitude of the immediate loss of income for a given amount of capital losses, and dynamic resilience, which is the ability to reconstruct and recover quickly. The paper proposes a rule of thumb to estimate macroeconomic resilience, based on the interest rate (a higher interest rate decreases resilience and increases welfare losses), the reconstruction duration (a longer reconstruction duration increases welfare losses), and a “ripple-effect” factor that increases or decreases immediate losses (negative if enough idle resources are available to cope; positive if cross-sector and supply-chain issues impair the production of non-affected capital). An optimal risk management strategy is very likely to include measures to reduce direct impacts (disaster risk reduction actions) and measures to reduce indirect impacts (resilience building actions).Publication Higher Losses and Slower Development in the Absence of Disaster Risk Management Investments(World Bank, Washington, DC, 2016-04)Global economic losses from natural disasters continue to increase. Yet, investments in disaster risk management are not universal, as they are traditionally seen as in competition with other development and economic priorities. The multitude of benefits from disaster risk management investments are not traditionally accounted for in cost-benefit analyses. This paper contributes to this discussion by highlighting the multiple benefits from disaster risk management investments, focusing on the avoided losses when a disaster occurs, but also on the impacts on economic development even before a disaster strikes. The paper's main message is that disaster risk management investments can provide two dividends: reduced losses when a disaster strikes, and a shift of investment strategies and perhaps even an increase in investment value that would benefit the economy even before a disaster strikes. Providing evidence to policy makers and investors about the existence of both types of dividends can provide a narrative reconciling short-term and long-term objectives, thereby improving the acceptability and feasibility of disaster risk management investments.Publication How Economic Growth and Rational Decisions Can Make Disaster Losses Grow Faster Than Wealth(2011-03-01)Assuming that capital productivity is higher in areas at risk from natural hazards (such as coastal zones or flood plains), this paper shows that rapid development in these areas -- and the resulting increase in disaster losses -- may be the consequence of a rational and well-informed trade-off between lower disaster losses and higher productivity. With disasters possibly becoming less frequent but increasingly destructive in the future, average disaster losses may grow faster than wealth. Myopic expectations, lack of information, moral hazard, and externalities reinforce the likelihood of this scenario. These results have consequences on how to design risk management and climate change policies.Publication The Economics of Natural Disasters : Concepts and Methods(2010-12-01)Large-scale disasters regularly affect societies over the globe, causing large destruction and damage. After each of these events, media, insurance companies, and international institu-tions publish numerous assessments of the "cost of the disaster." However these assessments are based on different methodologies and approaches, and they often reach different results. Besides methodological differences, these discrepancies are due to the multi-dimensionality in disaster impacts and their large redistributive effects, which make it unclear what is included in the estimates. But most importantly, the purpose of these assessments is rarely specified, although different purposes correspond to different perimeters of analysis and different definitions of what a cost is. To clarify this situation, this paper proposes a definition of the cost of a disaster, and emphasizes the most important mechanisms that explain and determine this cost. It does so by first explaining why the direct economic cost, that is, the value of what has been damaged or destroyed by the disaster, is not a sufficient indicator of disaster seriousness and why estimating indirect losses is crucial to assess the consequences on welfare. The paper describes the main indirect consequences of a disaster and the following reconstruction phase, and discusses the economic mechanisms at play. It proposes a review of available methodologies to assess indirect economic consequences, illustrated with examples from the literature. Finally, it highlights the need for a better understanding of the economics of natural disasters and suggests a few promising areas for research on this topic.
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