I get the point but I disagree.(im a monetary economist for whats worth and Im well aware of how externalities work). In poor countries the Girl In case of accident my blood type is wine shirt vulnerable are notoriously known for having carb based diets (rice, polenta, pasta) and as the lower classes are lifted out of poverty, they tend to consume more meat. In fact meat consumption is increasing in the world, because there are less and less poor people in the developing world ( mostly China and India are driving this). I come from a 3rld world country and we see the same phenomenom here also. I think the topic is a bit more elaborate than this, and that if we account for externalities, broader and more comprehensive attempt should be made so that the net effect is captured. (Poverty reduction, local industry disruption, whatever other factors both good and bad). This is a hard task, however.
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