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by syshum 1784 days ago
I don't know the original source, but it fairly common financial advice. Here is one source [1] but a simple DuckDuckGo search or Google Search will show many others. Some are starting to recommended 3-4x due to low interest which as I said in other comments I do not agree with.

[1] https://www.investopedia.com/articles/pf/05/030905.asp