Are the wealthy more efficient in their spending (and saving)? That is, are they more likely to buy a Pareto optimal product, avoiding paying extra for an identical product?
The possible mechanisms include less liquidity constrained, better information sources or education, not too "burned out" by work to think clearly about what to buy.
If so, then it helps explain widening wealth distribution: the rich get richer, the poor get poorer. How can this problem be solved? Mere income redistribution may not be the best way, because after redistribution, the poor might still spend inefficiently.
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