The art of negotiation.

Good negotiators are more likely to secure a pay rise, get the house or job they want, and keep the peace at home. However, the effect of anger does depend on the cultural context: a 2010 study (see tinyurl.com/digest090710) found that while it could help in a negotiation with someone from a European background, it backfired in negotiations with someone from an East Asian background, where traditionally such behaviour is regarded as inappropriate. Those who ranked higher on the Dark Triad spectrum did better in face-to-face negotiations than negotiations via the computer, whereas those who'd ranked low in these traits did better online compared to in-person. This also implies, of course that if you think your boss might have Dark Triad tendencies, it could be better to conduct a negotiation over a pay rise by email rather than face-to-face. [Extracted from the article]