Mood evidently affects the operation of System 1: when we are uncomfortable and unhappy, we lose touch with our intuition. These findings add to the growing evidence that good mood, intuition, creativity, gullibility, and increased reliance on System 1 form a cluster. At the other pole, sadness, vigilance, suspicion, an analytic approach, and increased effort also go together. A happy mood loosens the control of System 2 over performance: when in a good mood, people become more intuitive and more creative but also less vigilant and more prone to logical errors.

The extra daily social time of 1.7 hours in weekends raises average happiness by about 2%.

There are some conditions where you have to trust your intuition.

I don't try to be clever at all. The idea that I could see what no one else can is an illusion.

Slow thinking has the feeling of something you do. It's deliberate.

In strategic decisions, I'd be really concerned about overconfidence.

One of the problems with expertise is that people have it in some domains and not in others.