Negotiation skills.

https://abe-winter.github.io/2018/12/20/stalin.html

http://www.jamesaltucher.com/2014/05/the-ultimate-cheat-shee...

http://time.com/38796/6-hostage-negotiation-techniques-that-...

https://hbr.org/2016/07/how-to-negotiate-with-a-liar

https://hbr.org/2014/06/how-to-negotiate-with-someone-more-p...

https://www.fastcompany.com/3001209/negotiate-car-salesman-5...

https://www.theatlantic.com/business/archive/2015/04/ask-a-h...

https://bothsidesofthetable.com/when-should-you-allow-exclus...

http://www.bakadesuyo.com/2014/11/how-to-deal-with-difficult...

https://mindhacks.com/2014/05/26/the-best-way-to-win-an-argu...