Ideas & Opportunity

My market is small right now but growing fast. Is that a problem?

A starting point

A small, fast-growing market often beats a big, flat one, because you can ride the growth instead of stealing share in a knife fight. Investors and the best founders back the market that's small today but will be huge in five years. What matters is the slope of the curve and whether you'll be the default when it explodes.

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📄 Article
Free Intermediate

12 Things About Product-Market Fit

From a16z.com by Andreessen Horowitz (a16z) ~20 min read

Why we picked it

The nuanced counterweight: PMF isn't a single binary moment, it can be lost, and 'market' is doing more work than founders think. Read after the Andreessen essay to avoid the common traps.

  • PMF is a spectrum, not an on/off switch, and it can decay.
  • Product-user fit often comes before product-market fit.
  • Beware false positives from a small, unrepresentative group.
Open a16z.com →
✍️ Essay
Free Intermediate

The Only Thing That Matters

From pmarchive.com by Marc Andreessen ~15 min read

Why we picked it

The essay that put 'product-market fit' into the startup vocabulary. Read it for the gut-level description of what PMF feels like when it's happening vs when it isn't, the intuition behind the metrics.

  • Market matters most; a great market pulls product out of a startup.
  • You can feel PMF, customers buy as fast as you can ship.
  • Before PMF, do whatever it takes to get there; nothing else counts.
Open pmarchive.com →
📄 Article
Free Intermediate

Market Size: What is TAM, SAM, & SOM?

From carta.com by Carta ~12 min read

Why we picked it

A clear, no-nonsense primer on the three market-size numbers every founder gets asked about, with the bottom-up method that actually holds up in front of investors. Pick this over the SEO listicles because it comes from a platform that lives inside real cap tables and fundraises.

  • TAM is the whole category, SAM is what you can realistically serve, SOM is what you can win near-term.
  • Build the numbers bottom-up (customers times price), not top-down percentages of a giant number.
  • A defensible SOM matters more to investors than an impressive TAM slide.
Open carta.com →

People also ask

How big does my market need to be for this to be a real business? It depends on your ambition: a bootstrapped indie business can thrive in a market worth a few million, but a venture-backed one needs a market that... Intermediate 3 resources → What are TAM, SAM, and SOM and how do I actually calculate them? TAM is everyone who could ever use your category, SAM is the slice your product and geography can actually serve, and SOM is the realistic chunk yo... Intermediate 2 resources → Why does 'why now?' matter so much for a startup idea? Most great startups ride a change that just made something newly possible or newly cheap: a new technology, regulation, behaviour, or cost curve. I... Intermediate 3 resources → How do I size a market for India specifically when data is messy? Ignore the '1.4 billion people' headline; the real spendable market in India is a fraction of that. Use frameworks like Blume's India1/India2/India... Advanced 3 resources → Should I worry that my market is already crowded with competitors? A crowded market is proof that people will pay, which is a good sign, not a red flag. What kills you is entering a crowded market with no sharp wed... Intermediate 3 resources → What does 'validating an idea' actually mean? Validation is gathering real-world evidence that a specific group of people has a painful problem AND will change their behaviour (pay, sign up, sw... Beginner 3 resources →