https://www.kiplinger.com/article/saving/t063-c000-s001-how-useful-are-financial-rules-of-thumb.html
How Useful Are Financial Rules of Thumb? | Kiplinger
Jan 3, 2008 - Making financial decisions often involves a lot of "on the one hand, on the other hand." But sometimes you just want a fast answer -- a simple guideline to...
financial rules of thumbusefulkiplinger