There is a documentary about the psychology of financial decisions (behavioral economics): Mind Over Money: Nova (2010) https://moviewise.wordpress.com/2013/01/14/mind-over-money-n...

"Emotion may lead you to make bad financial decisions. For example, people who feel sad will pay more, sometimes four times more, for a consumer product than those who do not feel sad."

The "Nash equilibrium" also delves a bit into the psychology of decision making: https://www.reddit.com/r/math/comments/1tc80g/is_the_explana...