// description
A thinking technique that solves problems by inverting them — instead of asking "how do I succeed?" ask "how do I make sure I fail?" Then avoid those things. Often reveals blind spots, hidden risks, and assumptions that forward-looking analysis misses.
// history
The mathematician Carl Jacobi advised "man muss immer umkehren" (invert, always invert) as a mathematical problem-solving technique. Charlie Munger, Warren Buffett's long-time business partner, popularised inversion as a mental model in investing and business. Munger noted that most serious mistakes can be avoided simply by asking: what behaviour would guarantee failure? Then do the opposite. He applied this to Berkshire Hathaway's decision-making culture.
// example
Instead of asking "how do I build a successful Etsy shop?", ask "what would guarantee my Etsy shop fails?" Answers: poor product photos, no keyword research, no new listings for months, ignoring reviews, pricing too low to be profitable. Now flip those into your to-do list: invest in quality photos, research keywords obsessively, list consistently, respond to reviews, price for sustainable margin.
// katharyne's take
Inversion is my favourite mental model for pre-mortems and stress-testing plans. Before a launch, I ask: what would need to happen for this to completely bomb? The answers are usually very obvious once you ask the question — and they reveal prep work I hadn't done. The brain is weirdly good at predicting failure when you frame the question that way. It's uncomfortable but deeply useful.
// creative uses
- Before building a new digital product, ask: what would make a customer immediately request a refund on this? Bad file formatting, unclear instructions, missing promised content, no clear outcome. Use those failure points as your quality checklist before launch.
- Apply it to your Midjourney workflow: ask what would make your generated images consistently unusable — muddy prompts, ignoring aspect ratio, overloading with styles. Invert each failure into a rule for your prompt-building process.
- Use inversion for email list health: what would cause mass unsubscribes? Too many promotional emails, inconsistent schedule, off-topic content. Flip each into a policy and document it so your list stays clean even as it grows.
// quick actions
- Write a "failure document" for your next launch: list every way it could go wrong. For each failure mode, write one concrete prep action. Do those before you open the cart.
- Run inversion on your current biggest platform: what would get your Etsy shop suspended, your KDP account flagged, your Teachable course pulled? Make sure you're not accidentally doing any of those things right now.
- Ask the inversion question about your audience: what kind of content would make your ideal follower unfollow you immediately? Stop doing those things, and you've solved half your retention problem.
// prompt ideas
Apply inversion to my goal of [describe your goal — e.g. building a profitable KDP portfolio, growing my Etsy shop to $X/month, launching a successful course]. List every specific thing I could do to guarantee I fail at this. Be thorough and honest. Then flip each failure point into a concrete action or principle I should follow instead.
I'm planning to [launch a new product / enter a new niche / start on a new platform]. Before I commit, run a pre-mortem using inversion: imagine it's 6 months from now and this has completely failed. What are the most likely reasons it failed? Work backwards from failure to help me identify the specific risks, assumptions, and preparation gaps I need to address before I start.
Using inversion, audit my current [Etsy shop / KDP account / email list / course platform] for the most common failure modes in my niche. What behaviour would — if continued — guarantee my [account gets flagged / shop stagnates / list goes cold / students drop out]? For each failure mode, give me a specific policy or habit I should implement now to prevent it.