So the smart fraction matters most and the rest ‘don’t matter at all’ so to spea

So the smart fraction matters most and the rest ‘don’t matter at all’ so to speak.
Ethiopia has 100M people so it WILL produce enough of a cadre of competence for that population.
Same applies to India. There are only a total of about 700M white people in the entire world vs India’s 1.3B. So even with india’s relatively low average IQ they will produce more people above 130 than whites.
The best example is japan where the population is 125M which is half of the white population in the states. Yet just the difference between our 101 white people and their 104 Japanese people produces more outliers above 130/140.
The matter is even greater for china with a slight advantage over japan, but china produces far more engineers in the 115-125 range than either japan or the states.
In other words, it’s better to look at countries by the population of ‘smart people’ over 125 versus the burden of people under 90. This is why average IQ is a perfect proxy for every single measure from crime to GDP.