Programmatic Advertising: Does the Highest Bid REALLY Win?! 😈
We've all heard it: in programmatic advertising, the highest bidder wins the impression. Simple, right? Well... not always. 😈
Does the highest bid always win the impression?
Not necessarily. The familiar “highest bid wins” shorthand hides two separate decisions: which bid is actually submitted into an auction, and what amount is compared at the publisher end. Different auction mechanics and deal arrangements can affect the outcome (the precise rules depend on the DSP, SSP and publisher setup).
Two situations are particularly interesting for media traders: intermediary fees and campaign pacing.
1. Intermediary fees: the bid you enter isn't always what the publisher receives 💸
Imagine Nike and adidas both want to buy the same impression on the French sports publisher L'Équipe. Nike sets a €1.00 bid in its DSP. adidas sets €0.90. Surely Nike wins?
Not so fast. Between the advertiser and the publisher, there may be DSP fees, SSP fees, reseller margins and other commercial arrangements. Depending on how bids and fees are represented at each stage, a higher gross buying price can translate into a lower net value for the publisher.
(The amounts below are an illustrative scenario from the original post, not an audited reconstruction of a real L'Équipe auction.)
Nike vs adidas: how €0.90 can beat €1.00
| Illustrative metric | Nike | adidas |
|---|---|---|
| DSP-side bid / buying price | €1.00 | €0.90 |
| Supply route | Multiple intermediaries | More direct publisher SSP route |
| Illustrative value reaching publisher ad server | €0.50 | €0.72 |
| Outcome in this simplified comparison | Loses | Wins |
From the buyer's point of view, Nike appeared to offer more. But in this example, the publisher receives €0.50 from Nike's route and €0.72 from adidas's. No crooked referee required. 😅
Important distinction: not every auction compares a simple “net publisher bid”, and fees are not always deducted from the bid in the same way. Some are charged separately. The example illustrates why traders must understand the actual auction and fee mechanics rather than assume all DSP bid figures are directly comparable.
Why Supply Path Optimisation matters
This is precisely why Supply Path Optimisation (SPO) matters. A more direct route can reduce avoidable intermediary costs and help more of the advertiser's spend reach the publisher (although the shortest route is not automatically the best one).
Before optimising for price, make sure you're comparing the same placement and the same inventory quality. Otherwise, a seemingly cheaper reseller path may be selling a different ad experience altogether.
Explore our article on the two real challenges of SPO, our analysis of reseller-heavy bid request supply, and our programmatic media-buying audit guide.
2. DSP pacing: why a lower bid may be submitted 🏃
There's another twist, and this one happens before the bid reaches the SSP. A DSP may manage multiple campaigns that are eligible for the same bid request. Depending on its architecture, it may need to decide which campaign or candidate bid to submit.
That decision isn't necessarily a simple ranking by bid amount. A DSP also seeks to meet campaign objectives, budgets and delivery schedules. If one campaign is behind pace, the algorithm may give it a greater opportunity to compete, even where another eligible campaign would have offered more.
Example: Campaign A is bidding €2.00 but is comfortably ahead of its delivery target. Campaign B is bidding €1.80 and risks underdelivery. Under some DSP selection or pacing policies, Campaign B may be prioritised. (This is a possible mechanism, not a universal rule: DSPs differ, and pacing does not guarantee the lower bid will be chosen.)
My pro tip from the trading desk? Pacing settings can influence which opportunities a DSP pursues. But deliberately distorting delivery settings can create performance or budget risks: test changes carefully and stay within the advertiser's objectives.
What should media traders actually check?
| Question | What to investigate |
|---|---|
| What does the DSP bid represent? | Gross spend, media bid, net clearing price or another metric? |
| Where do fees sit? | DSP, SSP, reseller and any additional supply-side charges |
| Are we comparing like for like? | Same publisher, placement, format, device and inventory conditions |
| Could pacing influence selection? | Budget delivery, campaign eligibility, bid strategy and prioritisation |
| Can we validate the result? | DSP reporting, SSP/publisher reconciliation and available log-level evidence |
These checks help explain surprising auction outcomes without assuming foul play. They also show why financial transparency in programmatic matters.
Our view from the French Open Web 🦊
At GreyFox Ads, we believe efficient programmatic buying starts with quality inventory and transparent supply paths. Our Master Deal is designed to simplify access to curated French Open Web inventory, while our curation consultancy helps trading desks and publishers investigate supply efficiency.
The lesson? Don't just ask who bid the most. Ask what was submitted, what reached the publisher, and why the DSP chose that opportunity. 😉
Want to make your programmatic buying more effective?
Let's talk about quality French Open Web inventory, transparent supply paths and smarter curation.
Original LinkedIn post: Read the original post.