This video is from a youtube channel called the Improvement Pill, which focuses on teaching people to improve themselves and their lives. This video in particular is on sales techniques and methods of making people less defensive when persuading them.
The first technique reiterates the importance of body language, that something like slightly nodding can effect the person your talking to. The last two techniques are practical ways of lowering peoples defensiveness and opening them to persuasion.
Finally the video also shows how sales occurs throughout many aspects of our lives, and how important it is to be good at sales even if you are not a salesperson.
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