What are the best quantitative resources on learning negotiation?
People who haven't read laterally in it tend to only have one or two tools that have worked for them up to their level. Haggling, bargaining, and auction models aren't really negotiation. Reality is, it's the process of price discovery, often with people who are looking for rules they can break and points of leverage.
Also, have you heard anything on salience models?
To understand salience models, I think people need a background in traditional negotiation so that they can have the tools to apply to the model once they develop it. It's the why behind the model. Negotiation overlaps with organizational psychology and business strategy, and these days, political tactics as well, but for someone who doesn't have a background in this and who are the sort of person who still tells recruiters and hiring managers their current/last salary, it's not useful to throw them into the deep end.