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b) as ultimately material well-being is related to consumption, this is the measure that should be used - the integral of it over time, anyway.
c) it's very easy to damn GDP but hard to come up with viable alternatives that could be used in all countries, that's why it's used despite the shortcomings. Just like the democracy, you see.
b. I could go for the integral of GNI as telling us something more useful.
c. I'm not convinced that hiding the subtleties of reality behind a single index is going to tell us a damn thing. To that extent, HDI is just as intrinsically flawed as GDP - neither mean anything much out of context.