And, if you believe that financial bubbles are theoretically impossible, and you are a central banker, then you can make serious mistakes—as Alan Greenspan, to his credit, has admitted happened to him.
-from Misbehaving Rechard H Thaler
Where is the subject of the verb "happened"? Please Help. I'm not native speaker.
The implied subject is something like "making serious mistakes".
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detailer23Where is the subject of the verb "happened"?
It's not explicitly stated, but it is implicitly the fact that Alan Greenspan made serious mistakes because he believed that financial bubbles are theoretically impossible. Or, in shorter form, Alan Greenspan made mistakes. That's what happened to him.
CJ
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