The psychology behind irrational decisions

https://www.ted.com/talks/sara_garofalo_the_psychology_behind_irrational_decisions?utm_campaign=tedspread&utm_medium=referral&utm_source=tedcomshare
The psychology behind irrational decisions
Often people make decisions that are not "rational" from a purely economical point of view — meaning that they don't necessarily lead to the best result. Why is that? Are we just bad at dealing with numbers and odds? Or is there a psychological mechanism behind it? Sara Garofalo explains heuristics, problem-solving approaches based on previous experience and intuition rather than analysis. [Directed by TOGETHER, narrated by Pen-Pen Chen]. 1) What is your decision process? 2) Are the decisions you make rational?