This paper is an application of Darwinian analysis to the study of humans as inputs to the production process. Biologists believe that the only factor capable of explaining the extraordinary level of human intelligence is selection pressure from competition with other proto-humans. This...

With data from the nearly 6,000 households in the Nepal Living Standards Survey of 2010-11, this paper finds that the mean reduction in household firewood collection associated with use of a biogas plant for cooking is about 1,100 kilograms per year from a mean of about 2,400 kilograms per year....