What a meeting costs
The arithmetic nobody does, and it changes how you treat the invitation list.
An hour with eight people is eight hours. At any professional salary that is a substantial expense, and it is incurred whether or not anything is decided. Organisations that would require three approvals to spend the equivalent in cash spend it on a recurring meeting nobody has questioned in two years.
The cost is also larger than the hour. Work adjacent to a meeting is fragmented: the twenty minutes before it are not usable for anything demanding, and returning to concentrated work afterwards has its own cost. A meeting in the middle of the morning does more damage than its duration suggests, which is why a calendar with four scattered meetings can consume a day.
None of that argues for fewer meetings as a general policy. Some of the most valuable work in any organisation happens when people are in a room together, and the alternative to a meeting is frequently a long email thread that costs more and decides less.
What it argues for is that the meeting should be a deliberate choice with a stated purpose, rather than the default response to any unresolved question.
The practical test, which is unpopular and effective. For any recurring meeting, ask what would happen if it were cancelled for a month. If the answer is that people would find another way to get what they need, the meeting is a habit. If the answer is that something specific would break, name that thing, because it is the meeting's actual purpose and it is probably not what the agenda says.

