The US dollar literally is constructed as needed. It's pretty darn close to free thanks to electronic banking.
However, like all magic, using it has severe (and generally predictable) consequences.
Unlike fictional magic, the consequences take 4 years to kick in like clockwork. That, and the US's two term limit meant that presidents get to print money without political consequence. Worst case, they lose the midterms, then run again while blaming the next guy for the problem they created.
Presidents don't print money. Congress approves stimuli in the form of spending. Spending is always inflationary in nature because it injects money into the economy.
The Federal Reserve, nearly completely independent (for better or worse) from the Executive and Legislative branches, prints money in the form of quantitative easing and controls other levers through lending and interest rate strategies.
However, like all magic, using it has severe (and generally predictable) consequences.
Unlike fictional magic, the consequences take 4 years to kick in like clockwork. That, and the US's two term limit meant that presidents get to print money without political consequence. Worst case, they lose the midterms, then run again while blaming the next guy for the problem they created.
Hypothetically, of course.