I am a new master student who has just read Athey and Imbens (2006) "Identification and inference in nonlinear difference‐in‐differences models." They introduced the Changes-in-Changes (CIC) model. But why do people still rarely use it in empirical analysis? Thank you!

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    $\begingroup$ Maybe adding the arguments in favour of CiC would strengthen this question? I have heard about this technique, but also I don't know what's wrong with simple DiD. $\endgroup$ – Papayapap Mar 31 at 15:54

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