Behavioral finance is an important subject that all investors need to educate themselves. As humans all our investment decisions are driven not always by facts and rational reasons. Emotions play a big part whether we are buying or selling a stock or any other asset. We also suffer from all types of bias from information bias to recency bias. To date, over 180 cognitive biases have been discovered as shown in the following chart:

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Source: Personal finance is 80% personal and 20% finance, FirstLinks