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Brandolini`s law (also called the bullshit asymmetry principle), is the adage that “the amount of energy needed to refute bullshit is an order of magnitude bigger than to produce it”.
This denotes that it`s generally much easier to say something without concern for things such as the truth, evidence, or logic, than it is to prove that what was said is wrong.
Brandolini’s law is a general observation, rather than an empirical fact, so there are situations where it`s wrong; a generalized corollary of this principle, which holds in more situations, is "bullshit often takes more energy to refute than to create".
Accounting for Brandolini`s law can help you determine whether bullshit is worth refuting, help you understand how to refute bullshit better (e.g., by addressing only its key points), and help you understand and predict people`s behavior (e.g., by understanding why an expert isn`t responding to every piece of bullshit in their field).
Refuting bullshit doesn`t necessarily mean that people who believe it will accept that it`s wrong, or will change their associated stance; this often requires additional work, such as using debiasing techniques to address the cognitive biases that lead people to believe in the bullshit.