In the event that your treatment variable is imperfectly multicollinear with one of your control variables, a possible remedy would be to:
A) re-orient your base group.
B) use the within estimator.
C) gather more data, in hopes of getting more independent variation of the treatment.
D) use data reduction methods.

Question

Quizplus · Accepted Answer

Gathering more data can potentially introduce more independent variation in the treatment variable, reducing multicollinearity by diversifying the dataset and making the variables more distinguishable from each other.

In the Event That Your Treatment Variable Is Imperfectly Multicollinear