But suppose it could be implemented. Is it a worthy goal? I certainly don't think so.
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Well, in order for there to be true total equality, we'd all have to be exactly the same - the world would be a rather boring place in that case, so no. If only in economic terms, well, frankly I don't think people should be equal since there are those who aren't willing to put their all into earning it, so again no.
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I agree, but it should be obvious that many large differences in income aren't due to micro-level factors. Not everyone can be a lawyer, doctor, or investment banker. Someone has to clean the restrooms and collect garbage, and always will. Those who are doing the less well paid work ought to be able to afford basic things like health care and housing, even though the prices of these things are driven up by the market beyond what they could afford. The same principle applies internationally. No one would say that Moldova, for example has a GDP per capita of $2,100 while we have a GDP per capita of $40,000 because Americans work 20 times harder than Moldovans, especially since our average workweek is 33.8 hours (theirs would have to be 1.7 hours).