<b>"Header bidding means every advertiser competes for your slot"</b>

<b>"Header bidding means every advertiser competes for your slot"</b>

The pitch is real: simultaneous auctions beat the old waterfall. Genuinely better mechanism.

The asterisk: "every advertiser" is actually a handful of demand partners (SSPs) the network bothered to integrate, each bidding on behalf of buyers who've already decided your inventory is worth bidding on. More auctions don't create demand — they only surface demand that already exists for your audience.

🚩 Hidden variable: demand depth for <i>your</i> inventory. Header bidding on a Tier-3, low-viewability site is a fierce auction with two bidders and no floor pressure. The mechanism is sound; the room is empty.

Not saying header bidding is hype — saying it redistributes existing competition more efficiently; it can't manufacture buyers who don't want your impressions.