I still see some big issues with universal basic income, and would appreciate one of its supporters responding to some of them: Cost. $3.8 trillion by many estimates. That's nearly 20% of America's GDP. How is it possible to pull this much money out of the American economy without crashing it? Scope. I am of the opinion that one of the beauties of federalism is that policies can be tested first at the state level bef…
UBI actually injects money into the economy. Accompanying UBI would be reducing minimum wage to zero, managing inflation by increasing income taxes in higher brackets, and removing deductibles so that more tax is collected. By reducing minimum wages you encourage people to start up new companies — with no salaries to pay, you reduce startup costs significantly (there are still costs such as insurance, legal filings).
The whole point of UBI is to pay everyone the same guaranteed amount. If you start scaling back as income rises, what you are actually doing is a different scheme called Negative Income Tax. UBI basically pushes any wages into the taxable brackets immediately.
A national government would institute a UBI to encourage a mobile workforce, since reducing the cost of switching towns reduces the friction of moving to find better work. A UBI also reduces the level of exploitation of workers, so there would be less workplace induced chronic injury which is a net drain on the country. There will also be improved mental health as people aren't forced to work in dead end jobs just to make ends meet.
For the USA specifically, UBI would need to be accompanied by reformation of the health care system, basically completing the implementation of the Affordable Care Act so that health insurance is actually affordable, and not bound to employment. The USA will also need to implement similar systems of regulation of the cost of health care services and products.