Yeap, this spending is clearly unsustainable and sugar rush from it will be relatively short lived. To better demonstrate this point: imagine a country with st

Yeap, this spending is clearly unsustainable and sugar rush from it will be relatively short lived. To better demonstrate this point: imagine a country with struggling economy, government then issues a huge amount of debt at crowding out interest levels, it then build a huge dynamite statue and blows it up. In the near term you see a very pleasant spike in GPD, you have to manufacture dynamite, pay workers to assemble the statue, etc. You even get a bit more taxes from this activity. But after the dynamite was blown up, you end up with economy in an even worse shape and additional public debt burden. Obviously, the US government deficit spending is somewhat better than building dynamite statues (but only somewhat) and we can expect some degree of returns, but I highly doubt that the spending is efficient enough to outpace raising debts and the crowding out effect of the private sector.