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They have a high average IQ with a low standard deviation..

A large middle class is pretty much exactly what you'd expect based on the testing.

Why would anything need to have changed in the last 50 years?

If the genetics did not change, then something must explain their past performance. Perhaps the environment.

What are you referring to when you say "past performance" specifically?

Are you talking about the Great Leap Forward, which killed tens of millions?

You realize we're discussing individuals getting hired in a job market, not genocidal dictatorships in Asia 50+ years ago, right?