Great ideas

Executive summary

Ideas matter. Great execution on a terrible idea still fails. Define “idea” broadly: market size and growth, strategy, defensibility. Prefer unpopular-but-right kernels in small, fast-growing markets with a clear “why now.”

When to use this page

• Evaluating whether to build V1.
• Choosing among several plausible ideas.
• Writing the first sentence of a pitch.

What “idea” includes

Not just the product concept — also:

• Market size and growth over ~10 years
• Growth and defensibility strategy
• Whether you can get a monopoly in a small beachhead, then expand

Plans are worthless; planning is valuable. Long-term thinking is scarce and therefore an advantage.

Pendulum mistakes

Fashionable claim	Correction
Ideas don't matter; just ship and pivot	Execution ≫ idea (~10× importance, ~100× harder) — but a bad idea stays bad
More pivots = better	Successful pivots usually into something founders already wanted; random pivots rarely become huge
V1 must sound massive	V1 should own a small specific market

Google (13th search engine), Facebook (college-only), Airbnb (strangers’ couches) all sounded terrible — and therefore under-competed.

Mission and compulsion

• Work on the idea you think about when you are not trying to work.
• Wait until something feels compulsory; many founders wish they had waited.
• Hard important missions attract help; derivative companies do not.

Good startups usually take ~10 years. “Two years then I’ll do what I love” almost never works.

Markets

Prefer small + rapidly growing over large + stagnant. Investors obsess over today’s TAM; founders should obsess over growth rate and whether the market will top out.

• You cannot create a market that does not want to exist.
• Students often have better intuition for emerging markets than older investors.
• Sequoia’s question: Why now? Why not two years ago? Why too late in two years?

Build something you need when possible. Otherwise sit in the customer’s office and talk to them constantly.

Shape of a good idea

• Explainable in one sentence
• Either sharply different on one axis (Google = search that works) or truly new (SpaceX) — not “X with prettier design” or “Y for red-wine drinkers”
• Sounds crazy, is right; few competitors
• Path: monopoly in niche → concentric expansion (see Competition and monopoly)

Conviction vs crazy is a fine line. Expect most people to hate a great idea — that is a feature.

Student advantages

1. Intuition for young markets
2. Best environment to meet co-founders (more important than any particular startup)

Think market and customer demand first — the most common YC application failure.

Output

Expected outputs:

• One-sentence problem + solution
• Why now (≤5 bullets)
• Beachhead market + expansion sketch
• Defensibility notes (network, tech 10×, brand, scale)

Key takeaways

• Kernel first; ambition expands later.
• Unpopular but right; easy to explain; hard to replicate.
• Market growth and “why now” beat impressive-sounding TAM slides.

What to do next

1. Great products — turn the kernel into something users love.
2. Competition and monopoly for beachhead strategy.