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The Base Rate Fallacy is a formal fallacy. It occurs when too little weight is placed on the probability base rate of an event. People are succumbing to the base rate fallacy when erroneously judging the likelihood of an event without taking into account all the relevant data. The underlying mechanism is an overt focus on new information without acknowledging how this impacts the original assumptions. Old information is still evaluated and taken into account, however the newer pieces of information are given too much weight.