There's a lot of randomness in the decisions that people make. - Daniel Kahneman

Experienced well-being is on average unaffected by marriage, not because marriage makes no difference to happiness, but because it changes some aspects of life for the better and others for the worse.

My advice to students when I taught negotiations was that if you think the other side has made an outrageous proposal, you should not come back with an equally outrageous counteroffer, creating a gap that will be difficult to bridge in further negotiations. Instead you should make a scene, storm out or threaten to do so, and make it clear — to yourself as well as to the other side — that you will not continue the negotiation with that number on the table.

Although humans are not irrational, they often need help to make more accurate judgements and better decisions. [...] [They] also need protection from others who deliberately exploit their weaknesses [...].