The Dow and other indexes are up pre-trading at 5:30 AM EST. You have to remember the majority of US market value leans heavily toward the wealthy and institutions that have a large amount of money to invest, while many middle and lower-income live paycheck-to-paycheck, often with large credit card debt. Their only equity investments might be just in their employer 401k plan.
Last week, when tariffs were first announced that the extensions would not be extended, the market climbed. Most of the wealthy in the market will have huge benefits from Trump's promised tax cuts (about 70% to upper incomes - extending the expiring ones), and lower corporate taxes will help the income of corporations. In addition, there is a promise of fewer regulations, which is already happening with the demise of the Consumer Protection Agency, etc.
The big unknown is the tariff factor and how much it will affect inflation since, unlike the preaching of Trump, foreign companies do not pay but have to either reduce the income of the supplier or pass it on to the consumer or next step in the manufacturing process.
Under Biden, we had and still have one of the strongest global economies. Will Trump destroy it with his and unelected Musk with his chain saw massacre of jobs and agencies as well as a global trade war with our former allies - like Canada !!
Under Trump's prior term he called the trade deal that included Canada the best ever. Now it's the worst ever, and the solution is for Canada to be the 51st US state, not to mention Greenland, Panama, and Gaza with the glorious new Trump buildings and a new population.