The Transaction Tiebreaker for Marketplace Prioritization
Stop arguing supply vs demand — make the transaction itself the thing every team is accountable to.
- Difficulty
- Moderate
- Time to result
- ~months to results
- Steps
- 5
- Confidence
- 90%
Every marketplace eventually asks 'if we have to choose, do we serve sellers or buyers?' Holley's answer is to refuse the framing and instead anchor on a metric that only moves when both sides win — GMS, which by definition represents a buyer buying from a seller. This resolves the tiebreak without pretending both sides are equally weighted, and it prevents the failure mode of piling every team onto the buyer surface.
Origin
Tim Holley's articulation of Etsy's current prioritization posture, contrasted in the episode with Airbnb's own host-vs-guest evolution (Lenny Rachitsky's experience).
Core principles
- 01A seller comes to a marketplace to make sales; if they don't make sales, they leave. So demand quality is what actually retains supply.
- 02The pre-technology definition of a marketplace still governs: it is a place sellers go to sell.
- 03Prioritizing the transaction is not the same as building only for buyers.
- 04Front-end real estate is finite — too many teams on the buyer surface means they get in each other's way and productivity falls.
- 05The marketplace holds data no individual seller can see; that asymmetry is a product surface, not just an analytics asset.
How to run it
- 1
Reframe 'which side wins' as 'what makes the transaction happen'
Replace the side-picking debate with a transaction metric. Ask of every roadmap item: does this increase the odds of a buyer buying from a seller?
Pro tip The seller's real ask is not features — it is sales. A qualified buyer pool is the highest-leverage seller feature you can ship.
- 2
Cap the number of teams on the demand surface
Even though the transaction is buyer-mediated, do not staff every team against the buyer experience. Limited real estate means overlapping teams collide and slow each other down. Keep a team laser-focused on seller tooling — listing, sales management, fulfillment.
Watch out Interpreting 'buyers matter most' as 'everyone works on buyer features' is the direct cause of the collision problem Holley describes.
- 3
Diagnose constraint at the sub-category level, not the aggregate
At an aggregate level Etsy's 100M items look like abundant supply. Zoom into category, sub-category, and sub-sub-category to find the actual pockets where inventory type or volume is thin — that is where supply-side investment pays.
Pro tip Aggregate supply counts almost always say 'you are demand-constrained.' The truth lives two or three levels down.
- 4
Repay sellers with data they cannot get themselves
Use marketplace-wide data to tell sellers what to do next — put this item on sale in this window, add more photos, respond faster. Sellers are small business owners with no time and no visibility beyond their own shop; the marketplace sees the whole board.
Pro tip Sequence the asks. You will always have more things you want sellers to do than they have time for, and the right ask changes seasonally (holiday vs Mother's Day inventory).
- 5
Signal through the buyer experience, not just the seller dashboard
Change what the buyer-facing surface rewards, and sellers will follow without being asked. Highlighting listing photos in search, or surfacing fast message-response times as a quality signal, tells sellers what matters more forcefully than any seller email.
Pro tip This is the same mechanism Airbnb used to drive Instant Book adoption — defaulting search results to instantly-bookable listings made hosts adopt it voluntarily.
Watch out This is a powerful, blunt lever. If you surface a signal sellers cannot realistically satisfy, you punish good supply and it will leave.
In the wild
Rather than declaring buyers or sellers the priority customer, Etsy anchors on GMS — a number that only moves when a buyer buys from a seller. Teams still specialize (a dedicated seller-experience team owns listing, sales management, fulfillment) but the job to be done for everyone is facilitating the transaction.
→ The organization avoids both failure modes: seller-worship that never converts, and buyer-worship that starves the supply tooling.
Etsy knows more photos help buyers understand an item and increase sale likelihood, and knows great sellers respond to messages quickly. Rather than only telling sellers this, Etsy elevates photos in the buyer-facing search experience and surfaces responsiveness signals to buyers.
→ Sellers infer what to do from what the marketplace rewards, and buyers get better-informed purchase decisions — one change serving both sides.
Common mistakes
Reading aggregate supply counts as the whole story
100 million items looks like infinite supply and points every team at demand. But pockets at sub-sub-category level can be genuinely thin, and only category-level analysis surfaces them.
Asking sellers for everything at once
Sellers are makers with limited hours who want to spend time making. Dumping the full list of best practices on them means none get done. Pick the single highest-value ask for right now, and let it change with the season.
Stacking teams onto the buyer surface
Because GMS is transacted by buyers, it is tempting to point every team there. Front-end real estate is finite; teams collide, ship conflicting changes, and throughput drops.
Is it for you?
Best for
A marketplace PM or founder stuck in a recurring supply-vs-demand prioritization argument, or one whose teams are all crowding the demand surface.
Not ideal for
Pre-liquidity marketplaces that genuinely have no supply yet — at zero supply, a transaction metric measures nothing and you must go boots-on-the-ground for one side first.
From the transcript
“the job of a marketplace, even you know, pre pre the technology definition of a marketplace, is a seller will go there to make sales.…”
“That doesn't mean that every single team is working on building features for buyers cuz that it doesn't work. Not least because you have a…”
“GMS represents a buyer buying from a seller. So it doesn't necessarily say build only for one of your audiences or one of your customers.…”
“we have the insight into information into data that an individual seller won't. And so we can help them make hopefully better”
“we we use the buyer experience to kind of signal what matters”
From the episode
Inside Etsy’s product, growth, and marketplace evolution
Tim Holley (VP of Product)