The most important takeaway from Nobel Laureate Daniel Kahneman’s insights from ‘Thinking Fast and Slow’ is that the human brain has two systems, System one and System two. The former is good at ‘fast thinking’, which relies on our instincts and emotions to come to conclusions quickly. Kahneman refers to the latter as slow thinking, which is more deliberate and logical in its approach.
If I ask you to compute two plus two for me, System one will immediately throw up the answer. But if I ask you to manually multiply five thousand nine hundred four by twenty-eight thousand four hundred and ninety, you will automatically engage System two. There are some tasks to which System one is better suited, while there are others for which you need to rely on System two. When you end up using the wrong system for the wrong task, you will likely end up with the wrong answer.