The author says that there are two main functions in human brain. He calls them System 1 and System 2, and defines them as below.
System 1 operates automatically and quickly, with little or no effort and no sense of voluntary control.
System 2 allocates attention to the effortful mental activities that demand it, including complex computations. The operations of System 2 are often associated with the subjective experience of agency, choice, and concentration.
These two definitions are related to the title of this book. “Thinking fast” is from System 1. System 1 is impulsive and intuitive, that is to say, it is basically rooted into nature of human.
Then “Thinking slow” is from System 2. System 2 controls System 1, and it is capable of reasoning. It is in charge of doubting and unbelieving. It takes System 2 much time to think deeply. So, when there are more problems than System 2 can solve, we have to depend on System 1 however complicated the situation is.
In chapter 26th, he explains one of his most famous theories, prospect theory. According to prospect theory, we tend to turn down very favorable opportunities because we suffer from extreme loss aversion. If you want to understand it precisely, check Figure 10 in chapter 26th.
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