there, i've given you three hybrid systems - any of which are perfectly workable. with proper political and ethical backing, any of them could lead to the equitable distribution of the society's wealth. any of them could be corrupted and used for the enrichment of the few at the expense of the many. economic ideologies alone cannot solve the sort of problems you wish to address.
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So, isn't one of them better than what we have now, which is runaway capitalism or more correctly an ogliarchic plutocracy. The gap between the rich and poor is widening at such an alarming rate that a dictatorship is immenently the next progression. As Bush himself said, "it would be much easier if this was a Dictatorship". And if economic systems cant solve the problem, what's left, Divine intervention?