I think stocks rise in the short term; plummet hard in the long term. Here’s my (admittedly pessimistic) view of how this may play out:
1. First few test cases of Trump ignoring lower Court orders. (Happening now.)
2. Trump continues “pump and dump”-like cycle of announcing potentially harmful things but then not implementing them due to “concessions,” thus proclaiming victory and further increasing his 50+% approval rating.
3. Stock market keeps climbing due to “efficiency” of administration and removal of regulations and oversight.
4. Somewhat behind scenes, Trump continues purging opposition, election-integrity officials, free press; DOGE continues takeover of administrative state.
5. Eventually SCOTUS affirms a lower-court ruling that one (or many) of Trump’s actions are unconstitutional. (6-3, with Roberts, Gorsuch, and Barrett joining because they think there’s a chance history will judge them for sanctioning the death of the US if they reversed.)
6. This is the first real constitutional-crisis moment. Trump ignores the SCOTUS order, the R’s in Congress shrug, and there’s no groundswell in the streets (because tax cuts, deregulation, and no trans in bathrooms keeps enough people happy, or because they are scared).
7. Having confirmation that he can do anything he wants, Trump goes into full gear and explicitly targets opposition with arrests while rewarding cronies and loyalists with whatever they want from the federal coffers.
8. 2026 midterms very surprisingly result in a red wave; anyone looking into election irregularities is targeted.
9. However, all of this and the protectionist economic policies and deportations eventually catch up with Trump and inflation starts taking off while capital investment drops and investors flee the US.
10. In response, Trump takes over Fed; pushes interest rates down in jackass move to say he gave people affordable mortgages again.
11. This creates hyper-inflation and further crashes the economy.
12. Trump blames whoever makes the most sense at that moment—Dems, professional class, press, judiciary, etc.
13. Facing massive inflation and shitty economic prospects, people start taking it upon themselves to target those Trump blames, seizing their property or just killing for kicks.
14. America is now in free-fall, and Trump keeps plugging the holes in the dam with rewards and protections (legislation, pardons) for those who support him. Maybe launches a nuclear strike somewhere to boost lagging approval numbers. This doesn’t help markets and those with means flee.
15. Trump dies of old age/health issues without seeing the eventual fall.
Like others have said, this is bigger than the stock market, but just focusing on that, I think long-term prospects are dim at this moment barring something surprising happening.