The Development Impacts of COVID-19 at Home and Abroad: Politics and Implications of Government Action.

What is COVID-19's impact on development? What lessons can be drawn from development studies regarding the effects of and recovery from COVID-19? The unprecedented scale and scope of government interventions carry implications at all levels: global, national, and local. In this introduction, our team of Editors underline the importance of systematic substantive study to further knowledge acquisition, and rigorous global-, national-, or context-specific evaluation to inform evidence-based policymaking. The 12 articles summarised here capture these values and sense of "high quality". In particular, despite early considerations in the first year of the pandemic, they illuminate the need for diverse responses beyond business-as-usual, attention to the multiplicity of impact of policies formulated, and progressive strategies to counteract the impacts of this disaster around the world. The path of future research is clear: studies need to consider and give voice to marginalised groups to counteract the short- and long-term impacts of the pandemic.

Quel est l'impact de la COVID-19 sur le développement international ? Quelles leçons pouvons-nous tirer des études de développement concernant les effets de la COVID-19, et du redressement après son passage ? L'ampleur et la portée sans precedent des interventions gouvernementales comportent des conséquences à tous niveaux: mondial, national, et local. Dans cette introduction, notre équipe éditoriale souligne l'importance des études à la fois systématiques et substantielles, afin d'élargir l'acquisition de connaissances; ainsi que des évaluations rigoureuses au niveau mondial, national, ou spécifiques au contexte, ayant pour but d'informer une politique des décisions basée sur l'évidence. Les 12 articles résumés ici présentent ces valeurs et ce sentiment de « haute qualité¼. En particulier, malgré des considérations précoces pendant la première année de cette pandémie, les articles soulèvent la nécessité de réponses diversifiées, bien au-delà des démarches jusqu' ici habituelles (en anglais, « business as usual¼), l'importance de prêter attention à la multiplicité d'impacts des politiques formulées, et le besoin de stratégies progressistes, pour faire face aux impacts de cette catastrophe partout dans le monde. Le chemin à prendre pour les recherches futures est clair: les études doivent considérer et donner une voix aux groupes marginalisés, pour faire face aux impacts à court et longue terme de la pandémie.

Pesticide use, production risk and shocks. The case of rice producers in Vietnam.

In this paper, we try to understand pesticide input decisions among Vietnamese rice producers by examining the production risk effects of pesticide use, applying both a lottery game and a more traditional production function approach. Production function estimates show that excessive pesticide use makes production riskier. This result is supported by the lottery approach, which signals that more risk averse farmers use less pesticide, implying that pesticide is a risk-increasing input. We also show, that higher uncertainty regarding drought relative to pest is likely driving the increasing risk effect of pesticides. Therefore, we claim that the relative importance of multiple uncertainties on pest and water is relevant to determine the risk property of pesticide.

Early life malaria exposure and academic performance.

Malaria is a major cause of morbidity and mortality in sub-Saharan Africa. It is also a dynamic contributor to poverty through its effects on children's cognitive development. This paper examines the degree to which malaria in early childhood impacts on educational achievement in later childhood. The substantial decline in malaria in the region over recent years allows an assessment of its impact to be made. Focusing on Tanzania, we combine data from the Malaria Atlas Project and the 2010-2014 Uwezo household surveys (N = 246,325). We relate the district-level risk of malaria in a child's year of birth to his/her performance in tests of acquired cognitive skills (literacy and numeracy). For causal identification, we rely on differences across districts in the pace of decline in malaria prevalence occurring over the last 15 years. We control for time-invariant district level, age, birth cohort and survey year effects, as well as district-level trends and individual and household-specific factors. In addition, we use sibling variation in birth-year exposure to malaria to strengthen our identification. A ten percentage-point decrease in malaria prevalence in birth year is associated with a 0.06 standard deviation (p = 0.000) increase in English literacy achievement. This estimate is comparable in magnitude to education intervention programs with very large effects. Our results are robust to a large number of sensitivity analyses. We find no statistically significant effects of birth-year malaria exposure on attainments in numeracy and Kiswahili, and we argue that this is probably attributable to strong ceiling effects in these test scores. We conclude that in Tanzania malaria is an important factor in geographical variation in English literacy. This indicates that malaria is a significant public health challenge to educational achievement in this country, and probably in other regions with malaria.