#1- i was born in America so Luck or blessed depending on your belief structure.
#2- hard work. Although I got good grades in HS most all my friends did better than me (especially on the SAT ACT) yet I make more money then most all of them now... they were more concerned with having a good time in their 20’s than shaping their career... which is really hard to over come when you straighten up in your 30s
#3- I’ve become pretty good at what I do do smarts can’t be avoided when you work hard at a difficult endeavor

Anyway you slice it you are able to make the accurate assumption that I am indeed one of the richest persons in the world only because it is extremely likely I live in America which has the richest people in the world 100% due to its economy which is capitalistic so as others have stated capitalism is (as you know) the best economic structure to produce wealthy citizens and advance quality of life...

that is 100% due to its ability to leverage the natural man’s selfishness to Benefit others (if I want to be wealthy) I must provide a needed/wanted service to another better than someone else... so incentive is there and then supply and demand takes care of the rest...