Brandolini's Law
Refuting bullshit takes an order of magnitude more energy than producing it.
- Refuting bullshit takes an order of magnitude more energy than producing it.
- Operating: A consultant presents a 40-slide deck arguing for a major reorganisation.
- Investing: Short-sellers like Hindenburg or Muddy Waters know Brandolini cold.
- Everyday life: A friend forwards a viral claim that turns out to be wrong.
Italian developer Alberto Brandolini formulated this in 2013. The full name is the Bullshit Asymmetry Principle. The claim: the amount of energy needed to refute bullshit is at least 10x the energy needed to produce it.
It's free to make a confident-sounding claim. It costs serious time and effort to actually verify or rebut one. This asymmetry shapes a huge amount of how the modern information environment works, and a lot of how internal company politics work too.
Where it shows up in business:
- A competitor floats a misleading rumour about your company. To rebut it properly, you'd need to dig up the data, write a careful response, get legal review, publish, and hope anyone reads it. The original lie took 30 seconds to type.
- A junior employee makes a bold claim in a meeting. To carefully push back, you'd need to gather the actual numbers, the historical context, the relevant assumptions. Most people don't bother. The bold claim wins by default.
- A short-seller publishes a sharp 60-page report accusing your company of fraud. The market reacts in hours. Your CFO needs weeks to produce a careful rebuttal that nobody reads.
The practical implication: you can't refute every piece of bullshit that lands on you. There isn't enough time. So you have to triage. Some BS is worth fighting. Most isn't. Knowing the difference is a senior judgment skill, not a research skill.
When to fight: - The BS is about a load-bearing claim (your safety record, your numbers, your character) - The audience is high-leverage (regulators, key customers, key investors) - The cost of letting it stand is more than the cost of fighting
When to let it go: - The audience doesn't care or won't read the response - The BS will fade on its own (most things do) - Fighting draws more attention to it (Streisand effect)
A related principle: don't produce BS yourself, even when it would be convenient. The cleanup cost is always more than the original advantage. If you're not confident in a claim, hedge. The honest hedge is cheaper than the confident-then-corrected version.
Examples in the wild
A consultant presents a 40-slide deck arguing for a major reorganisation. The deck has six structurally wrong assumptions. Refuting them properly would take you a week, but the deck took 3 days to make. The reorganisation often goes ahead anyway.
Short-sellers like Hindenburg or Muddy Waters know Brandolini cold. They publish accusatory reports, the stock drops 30%, and by the time the company has produced a careful rebuttal, the short-seller has covered the position and moved on. The asymmetry is their business model.
A friend forwards a viral claim that turns out to be wrong. Showing them the actual evidence takes 10x longer than the original click. They usually don't read the rebuttal anyway. The damage is permanent.
Brandolini's Law is one of the mental models we apply through real cases inside the Pareto MBA — a part-time program for professionals who want to think clearly about business.