When might it be the case that a difference-in-differences estimator still does not identify a consistent estimate of the causal treatment effect?
A. If there are non-time varying effects that generate differences between treated and non-treated groups.
B. If there are time varying effects that generate amongst both treated and non-treated groups symmetrically.
C. If there are time-varying trends that are different amongst treated and non-treated groups.
D. If the treatment is non-normally distributed.
Answer: C
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