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I think he meant that you'd have the brackets apply to types of consumption instead of income level, so no tax on food, low tax on restaurants, medium tax on high-end electronics, insane tax on planes and yachts. I mean it sounds like it would be easier to maintain/enforce such tiering system than constantly fight with people trying to not technically be wealthy. Downside of course is that some people's luxuries are other's basic needs, but I wonder if there's been serious research on the implications of such system.
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What "high end electronics" would be taxed at a medium rate? Do billionaires not just use iPhones? Most high end private planes are the same models as regional jets (e.g. Embraer ERJ line), so a tax on them would still be mostly impacting normal folks' plane tickets.

The core problem remains the same: consumption does not scale with wealth. If we limit taxes go a handful of goods and services, then demand is just going to shift to something else.

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Easiest thing would be to not have any tiers of consumption. The stuff people "need" to spend money on such as food and housing would be handled by an automatic rebate, effectively a UBI. No other welfare, assistance, etc. What you earn you keep, unless you spend it, then you pay tax.
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