Hardest-Side-First (One-Player Mode)
Pre-PMF, ignore marketplace dynamics: own the hardest side and hack the other one.
- Difficulty
- Easy
- Time to result
- ~months to results
- Steps
- 4
- Confidence
- 95%
Most pre-product-market-fit marketplace founders burn their scarce time nerding out on supply/demand ratios and network-effect theory. Lauzier's counter-move is to shelve all marketplace dynamics until the core exchange of value is proven. Identify the side you have no reliable growth strategy for (usually supply, 80-90% of the time), own that side, and fake or borrow the other side from an existing channel until PMF exists.
Origin
Benjamin Lauzier's own practice across Lyft (employee #30, drivers side) and Thumbtack, taught in his Reforge marketplace growth course. The 'crutch' tactic he cites — piggybacking on an existing channel — is the classic Craigslist hack used by Airbnb and Thumbtack. He is applying the same framework to his own healthcare startup, Nura Health, where the health advocates are jump-started and demand is treated as the hard side.
Core principles
- 01Product-market fit is a prerequisite for marketplace dynamics, not a result of them.
- 02The side you cannot reliably grow is the side that defines your company; the other side can be borrowed.
- 03Teams already intuitively know which side is hard — the constraint they complain about is the answer.
- 04Supply is the hard side roughly 80-90% of the time, but check rather than assume (Rover, TaskRabbit were demand-hard).
- 05A crutch (Craigslist, job boards, subsidies, manual matching) is acceptable and temporary.
How to run it
- 1
Name the hard side out loud
Ask the team which side they know how to get and which side they have no reliable growth strategy for. The side nobody can name a channel for is the hard side. Thumbtack could always find plumbers in the Yellow Pages; finding homeowners with real projects was the hard part.
Pro tip It often takes an outsider to force the admission — teams in the weeds state the constraint casually without realising it is the strategic answer.
Watch out Do not default to 'supply is always hard'. Rover and TaskRabbit had waitlists of eager supply; their hard side was demand.
- 2
Pick a crutch for the easy side
Find an existing channel where the easy side is already latent and tap it rather than building it. Thumbtack posted jobs to Craigslist behind the scenes and pulled contractors browsing there onto the platform. Job boards, aggregators, manual sourcing and subsidies all qualify.
Pro tip Play one-player mode: the user should experience a working two-sided product even if you are hand-cranking the second side.
Watch out A crutch that becomes load-bearing forever is a business built on someone else's channel — set an explicit expiry.
- 3
Go deep on the core exchange of value
With the easy side hacked, spend all effort proving the exchange itself: do users come back, do they trust you, do you have the right checks so they hire the right person, is the experience delightful enough to retain.
Pro tip Frame the questions as retention questions, not matching questions — retention is the PMF signal.
- 4
Only then build the real growth engine for the hard side
Once retention on the core exchange is proven, switch focus to a durable, scalable growth strategy for the hard side — enough plumbers per market, enough drivers per city — and retire the crutch.
Pro tip This is the moment marketplace dynamics (liquidity, market health metrics, managed-supply questions) become worth your time.
In the wild
Thumbtack decided demand (homeowners with real projects) was the hard side. For supply, when a customer wanted a kitchen remodel, Thumbtack would post the job on Craigslist behind the scenes and pull the responding contractors onto the platform, letting the team focus entirely on whether homeowners would trust and return to the product.
→ Supply was solved with a borrowed channel while Thumbtack proved the core demand-side value proposition, later building a durable pro-supply engine.
Lauzier's own healthcare startup connects patients with health advocates. He explicitly refuses to treat it as a marketplace yet — he is jump-starting the advocate side and focusing everything on demand, the side he considers hardest.
→ The marketplace layer is deferred until the patient-side value proposition and acquisition strategy are proven.
Common mistakes
Nerding out on marketplace dynamics pre-PMF
Founders arrive with economic papers and supply/demand ratios before anyone has proven they want the product. It is intellectually seductive and strategically worthless until the core exchange retains users.
Trying to grow both sides at once with no channel for either
Splitting scarce resources across two unsolved sides means neither gets a reliable growth strategy, and the marketplace never reaches the density needed to feel useful.
Is it for you?
Best for
Pre-product-market-fit marketplace founders deciding where to point a small team and a limited runway.
Not ideal for
Marketplaces already at scale with product-market fit — they need liquidity management, not a one-sided crutch.
From the transcript
“focus on this core exchange of value go deep with one side of the marketplace and see if you can rely on some crutch some…”
“pick the hardest side is sort of my advice”
“find a way to like hack one side uh play one player mode is uh what it's Al also called sometimes”
“Supply is the hardest side maybe like 80 to 90% of the time”
From the episode
How marketplaces win: Liquidity, growth levers, quality, and more
Benjamin Lauzier (Lyft, Thumbtack, Reforge)