I recently read the book "Never Split the Difference" by Chris Voss, a book on negotiation by a former FBI hostage negotiator. It actually covered this, how the stereotypical sales tactics are actually pretty bad and he covers approaches that work much better. I highly recommend the book (or to watch some of his youtube videos).
 https://www.amazon.com/Never-Split-Difference-Negotiating-De... and his Youtube channel: https://www.youtube.com/user/NegotiationCEO
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