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Just a vast number of people responding perseverance/grit/attitude/education/drive or some other aspirational/feelgood bullshit when the obvious (and empirically true) answer is “how rich your parents are”https://twitter.com/writingtoriches/status/1350434417660067843 …
IQ or something functionally equivalent (let’s say IQ because it’s easy to measure) is probably in second place. So the top two are things you have no control over 
Ding ding ding
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