Earlier quoted context omitted.
I used it to calculate if buying my house was a better deal than renting. Turns out over 30 years it was exactly the same.. down to the dollar.
Yeah it was the same for me and that made me raise an eyebrow. At the end of 30 years I will own my home. At the end of 30 years of renting I'd be in the exact same boat I'd be in day 1 renting. The calculator makes a major assumption that if you rent you take your down payment money and invest it. Obviously the investment will be worth a lot after 30 years of interest. But this assumption is based on the false premi…
Even given the first sentence is true, its not a false comparison, given the assumption the reason that people don't save up the money (or just invest it gradually, same thing) is that they have something more valuable than investing to do with the money (i.e., that the decision not to do so unless they are planning to buy a house is rational). If so, the investment value is the correct lower bound on useful use of the money to compare a home purchase to, because what they'd actually do is something else that has greater expected utility (even if that utility isn't in the form of a cash payout in the future.)