Yes, but once you give everybody $X,000 dollars per month you'll spur inflation and in a couple years $X,000 will no longer be enough to live on. So then you've got to adjust your basic income to $(X+Y),000 per month to make sure everybody has enough, but that will spur more inflation and you'll be right back where you started. Meanwhile, that money has to come from somewhere and it will come out in the form of taxes. Remember, that only about one in three people in the US is employed. So now every working American has to be taxed enough to pay for three basic incomes plus their own incomes on top of that. The rich will complain about the added taxes, but it's the middle-class that really suffers, since they will NOT escape the added tax burden and their extra taxes combined with rising inflation mean they now make just barely enough to get by, effectively placing them in the lower-class. Now you've got a gigantic lower-class, a tiny middle class, and an upper class that only gets richer because they can accelerate the rate at which they siphon off income from the lower classes through price increases.
> once you give everybody $X,000 dollars per month you'll spur inflation
> Meanwhile, that money has to come from somewhere and it will come out in the form of taxes.
These two statements are contradictory. If it comes from taxes, it's not "printed" money and thus does not directly lead to inflation - unless it's through increased spending, in which case it means increased consumption and thus a growing economy.
Prices for basic necessities such as food and housing would rise, causing an increase in inflation. Meanwhile, spending for luxuries would see a contraction as additional tax burdens shrink discretionary spending.
The net effect is to shrink the middle class, as I explained.
> Prices for basic necessities such as food and housing would rise, causing an increase in inflation.
Only if previously a significant portion of people could not afford basic necessities at all and/or it's impossible to produce more of those basic necessities. Both of these seem rather dubious.
> The net effect is to shrink the middle class, as I explained.
You didn't explain anything, you made a bunch of predictions.
It's a nice idea, but it's not a good idea.