While attendance can be considered a form of participation, it will not earn credit in this class. Similarly, attendance alone at a management meeting where discussion is expected would not be considered acceptable. To grade participation, I will focus on the quality of your participation in class. Of course, the quality is related, at least to some extent, to quantity but quantity by itself is irrelevant or even negative . If quality is not there, then quantity helps point that out.
Quality is zero.
Any question or comment that helps understanding is not dumb. If someone says something that is wrong and it helps understanding, that question or comment is valuable. Oral participation helps you to prepare your analytical skills. You can develop organizing and communicating ideas to a group, a skill that is necessary in your managerial career. And, yes, there is plenty of time for everyone to speak at least once per class session.