Economist: It is generally less expensive to lower carbon dioxide emissions by building new low-emission power plants than by renovating existing ones. Therefore, developed nations that have little need to build new power plants can most efficiently help to lower global emissions by subsidizing the construction of new low-emission power plants in rapidly developing nations where many power plants are being constructed.
In order to evaluate the strength of the economist's argument, it would be most helpful to know which of the following?
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