Do lower yielding farmers benefit from Bt corn? Evidence from instrumental variable quantile regressions

Sanglestsawai, Santi; Rejesus, Roderick M.; Yorobe, Jose M.

doi:10.1016/j.foodpol.2013.09.011

Cited by 27 publications

(25 citation statements)

References 23 publications

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“…Mutuc et al [61] presented results from the Philippines showing that poorer farmers without access to irrigation and living further away from formal seed suppliers are less inclined to adopt Bt maize. However, in another study from the Philippines, Sanglestsawai et al [62] showed that if they can adopt Bt maize, lower-yielding farmers, who also tend to be the poorest, experience higher yield increases than farmers with higher yields before Bt maize adoption. Distributional impacts with regard to Bt cotton (see Section 3.4) support this inconclusive picture, indicating that the institutional environment in which GM crops are introduced has significant effects on their distributional effects.…”

Section: How Are Different Social Impacts Addressed?mentioning

confidence: 99%

Social Impacts of GM Crops in Agriculture: A Systematic Literature Review

et al. 2015

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It has recently been argued that the fragmented knowledge on the social impacts of genetically modified (GM) crops is contributing to the polarised debate on the matter. This paper addresses this issue by systematically reviewing 99 peer-reviewed journal articles published since 2004 on the social impacts of GM crops in agriculture; summarising current knowledge, and identifying research gaps. Economic impact studies currently dominate the literature and mainly report that GM crops provide economic benefits for farmers. Other social impacts are less well studied, but present a more complex picture. Studies on access to and benefits of GM crops show that these vary significantly depending on the political and regulatory setting. Substantial evidence indicates that intellectual property rights (IPR) and the private industry's dominance limit the access and utility of available GM crops to many farmers. Wellbeing is frequently discussed in the literature, but rarely investigated empirically. Existing evidence is contradictory and inconclusive. Impact studies from the Global North are virtually non-existent. Moreover, OPEN ACCESSSustainability 2015, 7 8599 two-thirds of publications are based on previously published empirical evidence, indicating a need for new empirical investigations into the social impacts of GM crops in agriculture.

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Section: How Are Different Social Impacts Addressed?mentioning

confidence: 99%

Social Impacts of GM Crops in Agriculture: A Systematic Literature Review

et al. 2015

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“…Instead of restricting covariate effects on conditional means, these regressions allow analyzing whether the effect of a given covariate changes over the conditional distribution of the dependent variable (Koenker and Hallock, 2001). Recent applications have used quantile regressions to model a range of heterogeneous effects from determinants of wages (Appleton et al, 2014), technology adoption (Sanglestsawai et al, 2014), social capital (Grootaert and Narayan, 2004) and CO 2 emissions (You et al, 2015) to impacts of economic inequality (Hassine, 2015;Nguyen et al, 2007). The conditional quantile function of given can be expressed as…”

Section: Quantile Regressions Model Specificationmentioning

confidence: 99%

Oil Palm Adoption, Household Welfare, and Nutrition Among Smallholder Farmers in Indonesia

et al. 2017

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. Abstract: The recent expansion of oil palm in Indonesia is largely smallholder-driven. However, its socio-economic implications are under-examined. Analyzing farm-household data from Jambi Province, Sumatra, oil palm adoption is found to have positive consumption and nutrition effects. However, these effects are largely due to farm size expansion that is associated with oil palm adoption. Potential heterogeneity of effects among oil palm adopters is examined using quantile regressions. While nutrition effects of oil palm adoption are found to be homogenous across quantiles, the effects on non-food expenditure are expressed more strongly at the upper end of the expenditure distribution. Terms of use: Documents in

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“…Failing to take this into account might lead farmers to neglect other good farming practices (Bergé and Ricroch, ). Economic studies should move towards a wider approach, taking into consideration farmers’ heterogeneity (Glover, ,b). Assessing the mean yielding/profits of a crop within an entire country/region will likely be biased towards wealthier and better informed/educated farmers (Sanglestsawai et al ., ). This is especially relevant in developing countries, where institutional networks are weak, making the enforcement of laws, policies and agricultural recommendations less effective (Dowd‐Uribe, ; Kruger et al ., , ; Shantharam et al ., ; Stone, ; Xu et al ., ).…”

Section: Discussionmentioning

confidence: 99%

The impact of secondary pests on Bacillus thuringiensis (Bt) crops

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Areal

et al. 2015

Plant Biotechnology Journal

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SummaryThe intensification of agriculture and the development of synthetic insecticides enabled worldwide grain production to more than double in the last third of the 20th century. However, the heavy dependence and, in some cases, overuse of insecticides has been responsible for negative environmental and ecological impacts across the globe, such as a reduction in biodiversity, insect resistance to insecticides, negative effects on nontarget species (e.g. natural enemies) and the development of secondary pests. The use of recombinant DNA technology to develop genetically engineered insect-resistant crops could mitigate many of the negative side effects of insecticides. One such genetic alteration enables crops to express toxic crystalline (Cry) proteins from the soil bacteria Bacillus thuringiensis (Bt). Despite the widespread adoption of Bt crops, there are still a range of unanswered questions concerning longer term agro-ecosystem interactions. For instance, insect species that are not susceptible to the expressed toxin can develop into secondary pests and cause significant damage to the crop. Here, we review the main causes surrounding secondary pest dynamics in Bt crops and the impact of such outbreaks. Regardless of the causes, if nonsusceptible secondary pest populations exceed economic thresholds, insecticide spraying could become the immediate solution at farmers' disposal, and the sustainable use of this genetic modification technology may be in jeopardy. Based on the literature, recommendations for future research are outlined that will help to improve the knowledge of the possible long-term ecological trophic interactions of employing this technology.

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Do lower yielding farmers benefit from Bt corn? Evidence from instrumental variable quantile regressions

Cited by 27 publications

References 23 publications

Social Impacts of GM Crops in Agriculture: A Systematic Literature Review

Social Impacts of GM Crops in Agriculture: A Systematic Literature Review

Oil Palm Adoption, Household Welfare, and Nutrition Among Smallholder Farmers in Indonesia

The impact of secondary pests on Bacillus thuringiensis (Bt) crops

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