There are three primary factors at play here.
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Trump’s greed and need to line his own pockets. He will wreck entire economic sectors to add another billion (in bribe money) to his accounts.
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Rich benefactors wanting more. They stay rich regardless of what the economy does, and have a ton of liquid. If it crashes, they can buy so much more of it up for themselves.
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Foreign actors looking to upset US hegemony. They don’t have to go to war, they don’t have to fight economic battles…just incentivize the right people to do the wrong things at home in the US, and we destroy ourselves. It’s cheap and easy for them.