Sure. So if you're wealthy, you invest your money. Let's say that the money which you would have received from the student loans which aren't forgiven was ear

Sure. So if you're wealthy, you invest your money. Let's say that the money which you would have received from the student loans which aren't forgiven was earmarked to invest in a new AI startup (with neural nets!). Those funds would be transferred to the startup's bank account, and then used to pay the salaries of people who work at that startup (who theoretically have a high marginal propensity to consume their income than the person who invested money in their employer). These employees then go out and spend money on stuff like Soylent and iPhone 7's and a bunch of other stuff which would be as you describe it "goods demand or consumption". Even if these wealth hoarding lending class members had just left their money in the bank, remember that these funds have a corresponding entry on the left side of the bank's balance sheet (not much cash/reserve balances in the banking system) and would also have to be loaned out to someone else in the economy by the bank. So I still don't see how lending money leads to guaranteed lower amounts of consumption in the economy?