Forget it. Back to regularly scheduled MDX discussion. You're mixing in and mixing up a lot of different concepts to the point that it is meaningless, and either purposely ignoring or obfuscating the simple basics. This isn't a game of Blackjack where I am the dealer and either you win or I win. Don't include "me" (the bank) in your example! Just focus on yourself. You are claiming that you made $4790 over that time period and somehow ignoring the fact that you paid out way more than that in interest! (the $8K that the bank got). You are applying the PV concept to one side of the ledger but not the other - somehow the bank's money is worth less in 5 years due to inflation but somehow you have only counted the interest you earned, conveniently forgot about the interest you also paid (which is more) AND ignored the fact that your money is also worth less due to inflation??? C'mon man that is criminally sloppy.You're over simplifying by a huge amount, I dont know why you are modeling this in one 5 year chunk these are all just formulas in excel that you can type in.
NPV of 50k at 6% discount 5 years is $42k. You are giving me 50k today that will be only worth 42k when you get it back. You get your 6% interest, netting 8k but that only makes you whole.
I got 50 into a 4.5% interest account, netting me $4790 in interest (risk free as you call it) View attachment 124653
So, the answer is no I dont agree with your math because in this scenario I make $5k and you got zilch. And I especially dont agree that the best way to invest 50k only nets you 4.5% returns.
I invested $30k to remodel the bathroom of my house which will, checks notes, net me somewhere in the range of 30-50% return in under 5 years. Mind you this is just an example of what that capital can be used for that will both give you gains and improve your life in the meantime.
You obviously haven't amassed a portfolio of investments as perhaps others have here because if you did, that would be the relevant comparison (do I take some of my current stash of money and use it to buy the car in cash, or do I borrow money at a 6% interest rate so I can leave that amount of money in my current portfolio of investments and I need to look at the rate of return on where the money would otherwise come from, so if I withdraw money from a short term bond fund earning 3% to go buy the car, that is effectively my cost of money since I am forgoing that investment income). Cool story that you invested $30K in your bathroom which will pay a 50% return in 5 years (you must have a crystal ball in terms of housing prices and where they will go in the next 5 years, good for you). Again your whole premise is based on this idea that you have this magical power to turn any dollar you touch into gold with huge returns. If that is the case then sure you should go borrow as much money as you can at any interest rate you can get below your rate of return...I mean jeez since you will net a 50% return in just 5 years then you would be happy to pay really high interest rates - grab as much money as you humanly can and don't limit yourself to just financing your MDX at 6% interest! Borrow $500K, borrow millions! Sounds like you have the midas touch haha
I would stick to your engineering expertise, or to modding the MDX or whatever, and if you want to tell others they "obviously don't understand basic finance" I would look in the mirror a bit first
Back to our regularly scheduled program!