If you are speaking to a hostile audience and you begin with a main point that you know will be something they will agree with,you are making use of the primacy principle.

Question

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The primacy principle is the idea that the information presented first has the most influence on the audience. Starting with a main point that the audience agrees with can help to establish common ground and build rapport, even in a hostile setting.

If You Are Speaking to a Hostile Audience and You