Here's an example for people who have $225,000 in student loan debt, which isn't an unreasonable amount given some of our situations.
"The question is what would happen if I were to invest that chunk of change (ie 225,000 of cash) into investments for 30 years. For ease of calculation I'm combining all those years of living cheap into 1 year. Makes the numbers easier to work with.
Average Return Scenario:
I invest $225,000 at the historical average (11%) over 30 years. That account would be worth $5,150,766. Subtract what I'd pay for the loan (225 +109 = 334) and I come out $4,816,000 ahead.
Bad Return Scenario:
Underperform the market (rate of return = 8%). Total worth over 30 years = $2,264,098. After paying for the loan: $1,930,098
Pathetic Return Scenario:
I do really bad and have a return average of 5%. Total worth over 30 years = $972,436. After paying for the loan: $638,436
Better Return Scenario:
Assuming 14% return (not unreasonable), total is worth $11,463,785. After loan: $10,825,349"