El otro blog para cosas más serias

El otro blog para cosas más serias
El otro blog para cosas más serias

miércoles, 29 de febrero de 2012

¿Qué medida es preferible? Nordhaus: la que proporciona mayores beneficios netos, no mayores beneficios en proporción a su coste

“Suppose we were thinking about two policies. Policy A has a small investment in abatement of CO2 emissions. It costs relatively little (say $1 billion) but has substantial benefits (say $10 billion), for a net benefit of $9 billion. Now compare this with a very effective and larger investment, Policy B. This second investment costs more (say $10 billion) but has substantial benefits (say $50 billion), for a net benefit of $40 billion. B is preferable because it has higher net benefits ($40 billion for B as compared with $9 for A), but A has a higher benefit-cost ratio (a ratio of 10 for A as compared with 5 for B). This example shows why we should, in designing the most effective policies, look at benefits minus costs, not benefits divided by costs.”

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