Rules of Thumb are Worthless

Rules of thumb, in the investment sphere, are at best worthless and at worst destructive for returns. Because the environment changes and the future doesn’t always respect the past. Blind, slavish adherence to our own experience and the mental shortcuts we’ve created can work against us and make us look foolish or, worse, miss out on generational opportunities that do not knock twice. I realized this while rea...

source http://thereformedbroker.com/2017/11/20/rules-of-thumb-are-worthless/