If you do not take that dollar from the taxpayer today that dollar still exist in the private sector today. You seem to make the assumption that all government spending does not lead to economic growth which is not so.If that dollar is borrowed money, it is not taken from the private sector today, so the private sector can use that dollar to expand the current economy.
If the government spends that borrowed dollar on a program such as the space program or the infrastructure, the payback to economy in the future can be far more than one dollar, making it a good investment. The fly in ointment is of course entitlements. The economic benefit here will be just one dollar.
Whether minted today or borrowed against the nation's future economy, the public sector dollar is removed from the economy and is not available to produce ANY benefit to the economy. That of course diminishes if not obliterates any benefit government spending might produce and sometimes will make the government benefit cost far more than it sppears. Also, that removed from the future economy is even more costly because it requires taking more from the economy to pay the interest on the debt created.
But the more the government borrows, the less the private sector money is worth today because of the huge debt being accumulated against it.
If you borrow and spend a hundred dollars today, do you feel that you are richer? You have a hundred dollars worth of stuff. But when you have to pay back that hundred dollars plus ten dollars more, are you richer or poorer? Every dollar you borrow and spend today is a dollar plus interest that you won't have in the bank to spend on down the line. And when you run out of ability to borrow, or the debts become due, you can be in a world of hurt no matter how much better off you felt at the time because you had extra money in your pocket or had bought some good stuff.
The same principle applies to countries.
I did not say that government dollar spent did not stimulate the economy. But what you seem to be unable to see, is that whatever government money is spent is removed from the private sector and is not available to be spent there. And, because the government has to use some of that dollar to fuel its own bureaucracy, you almost always get less value from money spent in the public sector than if the dollar had been left and spent in the private sector to begin with.
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