Question

 

Illustrate the Marginal External Cost of deforestation with the help of a case study.

01 Dec 2025
Answer :
Word Count : 1473
The marginal external cost of deforestation represents the additional harm imposed on society and the environment from the clearing of an extra unit of forest area, beyond the costs borne by the private agent carrying out the activity. In ecological economics, this concept highlights how market prices fail to capture the ecological, social, and long-term economic losses generated by deforestation. When a forest is cleared, the private decision-maker—such as a logger, plantation owner, or infrastructure developer—may consider only the immediate benefits such as timber revenue or land value. However, the broader consequences, which include carbon emissions, loss of biodiversity, soil degradation, disruption of hydrological cycles, and impacts on local communities, are externalized onto society. The marginal external cost increases as deforestation intensifies, because ecosystems often experience nonlinear levels of harm as thresholds are crossed. To understand this process more concretely, the case of deforestation in the Amazon rainforest provides a detailed illustration of how the marginal external cost manifests and escalates across ecological and social dimensions. In the context of the Amazon, deforestation has largely been driven by agricultural expansion, especially cattle ranching and soybean cultivation, along with logging, mining, and infrastructure development. At the private level, ranchers and agribusiness operators earn profits from converting forest into farmland or grazing land. These earnings represent private marginal benefits. However, the Amazon functions as a massive global climate regulator and hosts unparalleled biodiversity. Each hectare cleared contributes not only to localized ecological disruption but also to global atmospheric changes. The marginal external cost in this case takes the form of incremental carbon dioxide released due to loss of biomass and soil disturbance. This carbon contributes to global climate change, influencing temperature rise, sea-level increase, and extreme weather events. These effects are borne by global populations who ___ _______ ________ ________ ___ _________ __________ ______.
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