Marketplace marketing is its own discipline. You aren’t filling one funnel, you’re solving the chicken-and-egg problem (buyers won’t come without sellers, sellers won’t list without buyers), and the metric that decides whether you make it is GMV retention, not signups.
A founder building a two-sided marketplace has a harder job than a typical SaaS or DTC startup. You have to acquire supply and demand in step, in the right geographies or categories, and keep both engaged long enough for liquidity to take hold. As Andreessen Horowitz puts it plainly, most marketplaces fail because they never reach or maintain liquidity. Spending on generic “growth” before you have liquidity in even one slice of the market just burns the runway you need to find it.
That is why a generic startup-marketing playbook underperforms for marketplaces. The cold-start problem is specific, the two sides have different intent and different acquisition channels, and the failure points are structural: supply churns out before buyers arrive, demand lands on an empty category, or you scale spend before retention proves the model. We build around those exact moments, sequence the two sides deliberately, and report on liquidity and GMV retention. Every claim on this page is backed by a real source, listed at the bottom.
The case for doing this differently is not our opinion. It is what the data says, every figure sourced below.
Marketplaces don’t fail at acquisition. They fail at liquidity.
The trap is treating a marketplace like a single funnel. You can buy buyers and recruit sellers and still die, because the thing that has to work is the match: a buyer reliably finds a seller, and a seller reliably finds a buyer. Andreessen Horowitz states the failure mode directly: most marketplaces fail because they never reach or maintain liquidity. That is the cold-start problem, and it is the real job of early marketing, not raw signup volume.
The takeaway is not “acquire more of both sides.” It is “concentrate until one slice goes liquid.” The firms that scale pick the hardest side first, win it in a narrow category or geography, then let the easier side follow into a market that already works. A program that drives signups on both sides without producing matches is paying to grow an empty market, and an empty market churns faster than you can refill it.
Most marketplaces fail because they never reach or maintain liquidity. The job is matches, not signups.
Demand starts on the marketplace, not on Google
GMV retention separates the great marketplaces from the merely OK.
Signups flatter you. Retention tells the truth. In Andreessen Horowitz’s data, best-in-class consumer marketplaces hold supply-side GMV at or above 100% through month 12, while the average marketplace retains 80-95% in the first three months and then plateaus around 45-50% by month 12. That gap, not your top-of-funnel growth, is the single most predictive split between a marketplace that compounds and one that stalls.
So we don’t run marketplace marketing to a vanity signup number. We acquire supply and demand with retention in mind: bring on sellers who get matched fast enough to stay, point demand at categories that already have inventory, and reinvest in the cohorts that come back. A16z’s Olivia Moore calls GMV retention the most predictive metric of whether you’re building a marketplace that’s just OK or truly great, and we build the acquisition program to feed it, not fight it.
The split between a great marketplace and an OK one
Same starting cohort, very different month-12 outcome. Retention, not signups, is the predictor.
Source: Andreessen Horowitz (a16z), Olivia MooreAI search decides who gets discovered before your marketplace does.
Even though shoppers increasingly start inside marketplaces, the discovery layer above you is changing fast, and that is where a new marketplace earns its first cohort of both buyers and sellers. Pew Research found that about 18% of Google searches now return an AI summary, and when one appears, people click a traditional result far less: 8% of the time versus 15% with no summary. Worse for a young brand, searchers click a source cited inside the AI answer only 1% of the time.
The stakes are rising, not falling. BrightEdge tracked AI Overview presence growing from roughly 30% to 48% of queries in a year, a 58% increase. For a marketplace, the implication is sharp: when a founder, a seller, or a buyer asks an AI “where do I sell X” or “best place to buy Y,” you want to be the platform it names, not a link it skips. That is the AEO work: schema, entity clarity, category pages built to be quoted, and a reputation footprint the model can read and trust.
AI answers are eating the click
And only 1% of searchers click a source cited inside the AI summary.
Source: Pew Research Center, 2025Buyers already prefer marketplaces. They choose yours on price, shipping, and proof.
The demand-side gravity is real, and that tailwind is why you’re building a marketplace in the first place. But it doesn’t pick winners. Within the channel, buyers transact where the offer is best: 52.61% of consumers say better prices push them to a marketplace over a retailer’s own site, and 50.34% cite free or discounted shipping.
So demand marketing for a marketplace is not “drive traffic,” it’s “present a liquid, well-priced, well-shipped offer to the right buyer at the moment of intent, and make the trust obvious.” We point acquisition at categories where your supply is deep enough to win on selection and price, and we treat the buyer’s first transaction as the start of retention, not the end of the funnel. The platform that converts intent into a repeat habit, not a one-time order, is the one that compounds.
The offer signals that win the transaction
On the supply side, the slow follow-up is the leak.
Recruiting supply is half sales, half speed. A seller who fills out your “list with us” form is an inbound lead, and the same response-time physics apply: contacting a lead within five minutes instead of thirty makes you 100x more likely to reach them and 21x more likely to qualify them, per the MIT/InsideSales Lead Response Management study. Yet fewer than 25% of companies respond inside that five-minute window, which is an opening for any marketplace that treats supply onboarding as an operation, not an afterthought.
This compounds for marketplaces specifically. Sellers are the side that is usually hardest to acquire and quickest to churn out before liquidity arrives, so every recruited seller you’re slow to activate is supply you paid for and lost. We pair the supply demand we generate with fast, tracked onboarding: respond while intent is hot, get the seller listed and matched quickly, and keep them long enough for buyers to find them. The seller you already recruited is the cheapest inventory you’ll ever add.
Respond in 5 minutes, not 30, and you’re 21x more likely to qualify the lead. Most competitors don’t.
The supply leads most platforms answer too slowly
You can’t outspend the cold start. You out-position and out-prove it.
Two truths set the budget. First, paid demand has a real floor: Business Services search ran an average cost per click of $5.58 and a cost per lead of $103.54 in WordStream’s 2025 benchmarks, so a marketplace burning paid traffic into a thin market is the fastest way to run out of road. Second, the leading root cause of startup failure is building something the market doesn’t want, cited by 43% of failed VC-backed startups, which for a marketplace reads as launching without liquidity or positioning. CB Insights names poor product-market fit as the top root cause of death.
So spending more is not the strategy; getting the sequence and the proof right is. Trust does a lot of that work: 86% of B2B software buyers turn to peer-review sites to reach a verdict, and 92% are more likely to buy after reading a trusted review, so reputation is a real acquisition lever on both sides of your market. We point the budget at concentrating liquidity, earning third-party proof, and reinvesting in retained cohorts, and we report on matches and GMV retention, not vanity traffic that an empty market will never convert.
It isn’t spend, it’s building a market that doesn’t hold
Which for a marketplace means launching before you have liquidity or clear positioning.
Source: CB Insights, top reasons startups failThe chicken-and-egg problem is often the toughest hurdle for founders of marketplaces and other network effects businesses to overcome.
Andrei Hagiu and Julian Wright, Platform Chronicles
GMV retention is the most predictive metric of whether you’re building a marketplace business that’s just OK or truly great.
Olivia Moore, Andreessen Horowitz (a16z)
Most successful platforms prioritise one side first (usually the hardest side), letting the other follow naturally.
Cobbleweb, marketplace strategy
Ready to turn a cold start into a liquid marketplace?
If you’re building a two-sided marketplace, the win isn’t more signups on either side, it’s liquidity in a slice of the market that holds and compounds. We sequence supply and demand deliberately, build the search and AI discovery that earns both sides, and run intake fast enough to keep the supply you recruit.
Let’s look at where your liquidity is closest and build the plan to get there.
Frequently asked
What makes marketing a marketplace startup different from a normal startup?
Should we acquire buyers (demand) or sellers (supply) first?
What metric should we hold our marketing to?
Does SEO still matter if shoppers start inside marketplaces?
Why does fast follow-up matter so much for supply recruitment?
What does a marketplace marketing engagement with MoonSauce focus on?
Every figure on this page comes from a primary platform, an independent study, or a named industry source. No competing-agency stats, no made-up numbers.
- Andreessen Horowitz (a16z), GMV retention (Olivia Moore)
- ChannelEngine Marketplace Shopping Behavior Report 2025, via PR Newswire
- Digital Commerce 360, online marketplaces consumer survey 2024
- Pew Research Center, AI summaries and clicks (2025)
- BrightEdge, AI Overviews one-year presence
- WordStream (LocaliQ), 2025 Google Ads Benchmarks
- CB Insights, top reasons startups fail
- G2, why reviews matter for software brands
- MIT / InsideSales Lead Response Management study, via Casey Response
