William J. Bernstein - "The Investor's Manifesto" - Chapter IV
December 14 2017
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CH. IV - Building Your Portfolio
By age 25, you should be saving about 10% of your income. If you are already 45, you need to save 50% of your income. (Or just start earlier.)
To be “safe”, you can spend 2% of your nest-egg. For example: If one needs $50.000 p.a. to live, to be secure, one has to have saved $2.5 million.