First, I won't stop pointing out that the way people talk about the government's fiscal operations is incorrect, because the mischaracterization adopts a conservative, gold-standard type thinking that is destructive. Talking about the government like this has got us exactly where we are today.
Second, you should read up on the history of money, if you have any interest. It doesn't exist because it is a more convenient way of trading than barter. It exists to move real goods and services from the private sphere to the government. Money as we know it exists because the government needs a mechanism other than the direct application of brute force to procure goods and labor from individuals and put those resources to public ends. So the government creates money in tandem with an obligation to pay taxes in that money. The obligation to pay taxes drives the demand for the money, which in turn allows the government to "purchase" real goods and services with its otherwise worthless money. You can
read about the history of money here, which includes historical examples of the introduction of money into societies by governments.
