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As long as the US retains the ability to control the supply of USD (Which France does not have over its own currency) the US model is sustainable.
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Is the current situation in US sustainable? I don't see it. But again, we said the same for Japan for the last 3 decades and they still seem fine.
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It could be stable in the US. The basic idea behind Keynesian economics is: during contractions, decrease taxes and increase spending; during expansions, increase taxes and decrease spending. Doing this helps smooth out business cycles, promotes steady growth, and collects revenue for the government.

The problem is, as we've seen, our government is cutting taxes and raising spending no matter where we are in the business cycle. That's a very easy problem to solve, if there is the political will, but right now, there isn't.

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You'll have to pardon my French /s. Economic model only works in theory.
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This offers nothing insightful or useful, and doesn't even address a fundamental problem. It's the sort of thing someone says when they don't understand a topic well enough to weigh in, but they still feel impelled to weigh in.
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That's the issue with your post because you don't even understand the issue isn't an economical but a social. Again, don't pretend you know what you are talking about because of tiktok.
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Are there any economic models that actually work (or have been allowed to work), not just in theory.
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