B2B and consumer startups differ in who pays, how much, and how often: business-facing companies sell large contracts to few customers through direct sales, while consumer companies sell low-priced products to millions through self-serve channels. Y Combinator's own business-model guide, published as a Startup School talk, catalogs nine models and their metrics, defining the difference in revenue terms.
What is the actual difference between B2B and consumer?
The distinction is the buyer, and everything economic follows from it. A B2B startup sells to organizations — enterprises with thousands of employees, or smaller companies buying software for a team — where the buyer is not always the end user and purchase decisions pass through procurement. A consumer startup sells to individuals, who decide for themselves, pay from their own pocket, and can abandon the product in seconds.
That single difference reshapes the whole company. In Y Combinator's guide to business models, the enterprise category is described as selling large fixed-term contracts to big companies, with primary metrics like bookings, annual contract value, and pipeline. The consumer subscription category, by contrast, is described as usually sold to consumers at lower price points, from a higher volume of customers, with growth driven by scalable, self-serve acquisition channels. The guide is paired with a Startup School talk by YC Group Partner Aaron Epstein, who walks through how to monetize and price each model; the full talk is public and worth an hour of any founder's week.
Y Combinator's Startup School talk in which Group Partner Aaron Epstein walks through nine startup business models and how to price each one.
How do the revenue mechanics differ?
Revenue in B2B arrives in large, infrequent chunks. An enterprise deal can run $100,000 or more per year, close over months of demos and gatekeepers, and produce what the YC guide calls lumpy growth — month-over-month percentages stop making sense when one contract moves the number. Consumer revenue arrives in small, constant streams: a $10 monthly subscription, an in-app purchase, an advertising impression. Each transaction is trivial; the business only works at volume.
| Dimension | B2B | Consumer |
|---|---|---|
| Customers | Very few, large deals | High volume, low price points |
| Sales motion | Direct sales, pilots, long cycles | Self-serve, scalable channels |
| Key metrics | Bookings, ACV, pipeline | Retention, CAC, growth rate |
| Revenue shape | Lumpy, contract-driven | Recurring or transactional, smooth |
| Buyer | Not always the end user | The user decides |
The gross-margin story diverges too. E-commerce consumer models carry cost of goods sold on every order, which the YC guide flags as higher COGS meaning lower margins. Software sold to businesses typically has high incremental margins, because one more seat costs the vendor almost nothing to serve.
Why do growth expectations differ so sharply?
Paul Graham's essay Startup = Growth defines the whole category: a startup, he writes, is a company designed to grow fast, and everything else associated with startups follows from growth. But the achievable growth curve looks different on each side of the market. Consumer products can compound virally — every user can recruit the next — which is why consumer wins look like hockey sticks and consumer graves are the most numerous.
B2B growth is bounded by the sales team's capacity. A company selling $100,000 contracts cannot double customers in a month without doubling closers, engineers, and implementation staff. The compensation is durability: a signed enterprise contract renews annually, and switching costs accumulate in workflows and data. Consumer retention is earned every single day, which is why the YC guide lists month-one-to-month-two retention as a primary metric for consumer subscription businesses.
Which model should a founder pick?
The honest answer is that the market picks first — the founder's insight usually fits one buyer type — but the decision can be stress-tested. A practical sequence:
- Identify who feels the pain most acutely and whether they can pay from a budget they control.
- Estimate deal size and sales cycle honestly: few customers at high price, or many at low price.
- Check whether acquisition can be self-serve or requires a sales force, and price that into the model.
- Pick the two metrics that decide survival — retention and CAC for consumer, pipeline and contract value for B2B.
- Model the path to profitability on current growth and spend, not on a future funding round.
Can a startup do both?
Some try, usually through a free consumer product that funnels into business seats, or a prosumer tier between the poles. The risk is building two companies at once: one that needs viral loops and obsessive retention work, and another that needs salespeople and implementation. The YC catalog treats these as separate models with separate metrics for exactly that reason — mixing them without deliberate design tends to mean executing neither well.
How does customer acquisition differ?
Acquisition is where the two models spend money in opposite places. A consumer startup's acquisition has to be scalable and self-serve — content, virality, app-store placement, install campaigns — because the revenue per user cannot support a salesperson's time. The YC guide's consumer categories all list growth driven by scalable, self-serve acquisition channels, and the metric that decides survival is whether a customer costs less to acquire than they return in margin over their staying lifetime.
A B2B startup inverts the equation. A salesperson closing six-figure contracts can spend weeks per deal, fly on-site, and still generate a return, because the contract value carries the cost of human selling. That is why the guide's enterprise playbook begins with fee-based pilot contracts and letters of intent: the acquisition motion is a pipeline — top of funnel, demo, close — managed like a forecast rather than an advertising budget. The failure modes invert too. Consumer companies die when acquisition channels saturate and retention cannot hold; B2B companies die when the pipeline math quietly stops working and nobody recalculates it.
Where does churn bite each model?
Churn is consumer economics' silent tax. A subscription product that loses five percent of subscribers monthly must replace more than half its base every year just to stay flat, which is why the YC guide tracks month-one-to-month-two retention as a primary metric and why consumer teams obsess over onboarding, habit loops, and payment recovery. Every retained user compounds; every leaked bucket has to be refilled at acquisition cost.
B2B churn is heavier but slower. A cancelled enterprise contract removes a large revenue slice at once, but the events are rare, visible, and usually preceded by warning signs — usage decline, support escalations, an executive sponsor's departure — that a team can watch. The practical discipline is the same on both sides: measure retention on a defined cohort, not on a blended dashboard that hides the leak. What differs is the clock speed. Consumer churn is a weekly weather report; enterprise churn is an annual seismic event, and each demands its own instrumentation.
What happens to pricing power over time?
Pricing power grows differently in each direction. A B2B product embedded in a customer's workflow accumulates switching costs — data, integrations, trained staff — which supports annual price increases and expansion revenue as customers grow, the pattern the usage-based category in the YC guide formalizes by charging per API request or record so revenue scales with the customer's own volume. The floor is competition and procurement's willingness to run a renewal bake-off.
Consumer pricing power is thinner and stranger. A service millions of people pay a few dollars for cannot raise prices sharply without triggering churn, so the leverage comes from bundles, tiers, and new categories rather than list-price moves — and from the advertising and transaction models, which monetize attention or commerce instead of charging the user directly. The result is a structural asymmetry worth memorizing: B2B companies defend margin with contracts and switching costs; consumer companies defend it with habit and scale. Neither is easier. They are simply different machines, and a founder's honest answer to which machine they want to operate is the first economic decision the company makes.
What stays constant across both models is the underlying math Graham describes: growth as the compass for decisions. Whether the growth comes from a million people paying a little or fifty companies paying a lot, the startup exists to compound. The difference between B2B and consumer economics is not which math applies, but which constraints bind first.
