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Paul Graham Essay "How to become a Billionare"
Paul Graham
The formula to becoming a billionaire through startups is growth rate + Market size (how long the growth rate can last). You don't have enough information to know what everyone wants, so think about what you want and need and just go for it. There will always be some need for it if you need it.
What You (Want to)* Want
Paul Graham
You can't want what you want without not wanting what you don't want; doing one is nearly impossible so doing both is nearly impossible