Mercury retrograde periods would not be good times to do anything involving communications, such as launch a magazine, website, or an advertising or publicity campaign.
These phases are also considered poor times to launch any new endeavors, even if they are not related to the communications industries.
Similarly, a retrograde period is not a good time to sign any contracts or even to shake hands on any new agreements. Do not close on a house during this time nor sign a lease. Verbal agreements are considered the same as written ones. The environment will be quite fluid and changeable, no matter what you are told or what you think.
It’s not that the people you are dealing with are necessarily duplicitous. It’s just that nobody can fully predict what conditions will be like later. If you start a new job, it won’t necessarily be the position you thought it was when you accepted it. If you are a manager, you will have difficulty choosing the right candidate for the job, so, if you can, hold off hiring anyone. If you buy a house, problems could crop up later that were completely unanticipated.