Many from the richest part of today’s China did not believe in talks about common prosperity and so from Hong Kong in years 1984-1997 (when HK was returned under Chinese control) nearly 1 million people emigrated (about one eight of population).
(Despite different average in Hong Kong is economical inequality even bigger than in rest of China.)
Even more people did not return from study abroad. To be more concrete: in years 1987-2009 it was about 1 160 000 people. But gradually returns more and more, during for world crisis year 2009 it was already 56 percent.
In that time they returned because of problems abroad, many with foreign passport (although sometimes hidden – China does not allow double citizenship), to try find a job at home or to outsource their business to country with lower costs.