Earlier quoted context omitted.
> The case in point was for a 'wealthy person' (not my term, I don't like it but let's roll with it) who holds the debt of a student borrower. This is not a real scenario. Virtually no one's education is funded by direct loans from wealthy individuals. Student loans are issued by banks. When you pay a dollar on your student loans' principal, that dollar ceases to exist. The bank might turn around and make another loa…
> Student loans are issued by banks. Which comes from depositors supposedly "hoarding" money in banks. (In fact, banks loan out a >1 multiple of deposits, called fractional reserve banking. So "hoarding" money in banks results in more money being spent, not less!)
Even in a hypothetical scenario where banks always loan the maximum amount they can, a dollar in the bank would result in less money in the economy than simply handing the dollar to someone on the street. Fractional reserve lending means that the bank can issue a 90 cent loan after receiving a 1 dollar deposit. And we assume that the 90 cent loan will stay in the bank as a deposit so that they can issue another loan for 81 cents. And so on. In this model, a dollar in the bank actually results in ZERO net money entering the economy. It's all deposits in the bank that can't be withdrawn because it would cause a cascading loan call.
At any point in this lending chain, if someone decides to withdraw the money they were loaned, it stops the chain and some amount of money less than 1 dollar enters the economy. It might be 90 cents, 81 cents, or 15 cents, but it will always be less than the dollar that was initially deposited. So even in the model where banks always lend as much as possible, there's still less money entering the economy than was deposited.
And of course, banks are aware of the cascading loan call problem and therefore keep more reserves in aggregate than the minimum so that they don't end up in this situation. Which means that the impact of a dollar deposited scales back even further.