Just remember that we do not measure in the US IQ these days because the results would be very painful to look at for the poor of the US.
Maybe the Chinese are very efficient with their money (try living on $4 a day in the US; or what does $4 mean in China?), or don't need as much money due to... a socialist system and/or, if you prefer, Hong Kong Post. Maybe they've started to realize the dream of Star Trek's "economy". ;)
"Consider the aggregate IQs of rural and urban/suburban whites [in the US]. During the 1970s according to Wordsum-IQ data, the intelligence gap between whites raised on farms and those who grew up in an urban/suburban background was enormous, almost exactly equal to the white/black gap. The data would indicate that a non-trivial slice of the white farmboys of the 1970s suffered from clinical mental retardation".
Banning whatsapp to get local competitor which employs local talent, is actually better for China from poverty point of view, isn't it?
Chinese urban households have only a per capita income of 29,831 yuan – an abysmal $4,500 a year.
https://geopoliticalfutures.com/china-is-still-really-poor/
And we see the effects of poverty on education: "Surveys by Rozelle's team have found that more than half of eighth graders in poor rural areas in China have IQs below 90, leaving them struggling to keep up with the fast-paced official curriculum"
http://www.sciencemag.org/news/2017/09/one-three-chinese-chi...