Should weekly stock returns be compared using the same start and end dates?

This is a general question with a newly defined scope, prompted by the original reporting linked below. It does not assume that reported allegations were established as fact or remain current, and does not decide anyone’s private affairs or individual responsibility. Question review (2026-09-14): The original poll was closed because the headline and broad choices did not clearly identify what respondents were judging. Its question, choices, votes, comments, URLs and sources are preserved. The new poll is a separate question with a newly defined scope, not an equivalent version of the old survey. Do not combine their results or compare them as a time series. Original poll: https://askrs.com/en/t/kospi-rebounds-about-11-5-over-a-week-while-kosdaq-rises-about-8-3913i-hh508aw5