Beware of Recency Bias Following an Outlier Year

"Of all the cognitive biases that influence human behavior, recency bias is by far the most harmful to long-term investors. This is the tendency for investors to project their most recent experience into the future. In doing so, investors are assuming that what has occurred in the recent past will continue to occur indefinitely. At the same time, investors are also assuming that if something hasn’t occurred in the recent past, it won’t happen in the future."