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The rule was generated in the 80s. I am sure you likely knew about it but perhaps not the name.

Actually I don't think I did. I could do the math though and determine what I could actually afford. The rule was probably applied to me though. When I first got preapproved, it was too low to buy any house in my area. I had to get a 3rd job for like a year to increase my income level enough to be able to get pre-approved for high enough to actually buy a house.