There are smarter economists than can probably explain it better than me. Keep in mind that if we spend $500B on notes, the increase on GDP is much larger than

There are smarter economists than can probably explain it better than me. Keep in mind that if we spend $500B on notes, the increase on GDP is much larger than on just this new spend. The hope is that we are spending this on projects that are economy enablers that have a compounding effect. Meaning that we just need to recover the say 3% of the $500B over a 10 year period. This spending is best spent on infrastructure and technology. Even if we don't get the full return, keep in mind that most notes get spent on non-GDP increasing projects making break even a good deal. (Sorry, I still don't have the best ways to explain this, I need to find some writing that is clearer.)