The difference between a millionaire and a billionaire is a thousand. Population isn’t 10 times larger than it was 30 years ago. Inflation hasn’t grown by a thousand percent in 30 years. None of the things you named can account for an order of magnitude increase in the number of billionaires. Nothing you said can account for them holding a larger percentage of the total wealth. It’s not like when there was 60 and now that there are 664 that they both had the same relative proportion of the wealth. The wealth gap is increasing. So that hundred-plus million number that they hold more wealth than keeps getting larger and that number is growing faster than the population.