The archive · Business Models · Strategic decision · 2000–2005
Google's AdWords Select (2002): ads ranked by bid and click-through, billed only on clicks
In 2002 Google re-priced AdWords as a per-click auction: bid and click-through set rank, advertisers pay only when someone clicks — the model search ads run on.
What it had to solve
In October 2000 Google launched AdWords, self-serve text ads billed per impression, like every banner network of the day. By early 2002 rival Overture was selling top placement in paid listings, so Google re-priced its product around what advertisers actually wanted: results, not page views.
How it works
In October 2000 Google launched AdWords, a self-serve program that let any business buy text ads on search results, billed per impression like the banner ads of the day. In February 2002 the company replaced that pricing with AdWords Select: advertisers bid per click, ad position combined bid with click-through rate, and advertisers paid only when a visitor actually clicked.
The shift was a direct answer to rival Overture, which already sold top placement in paid listings. Google's twist was making relevance part of the auction: ranking depended on how much an advertiser paid and how often people clicked, so a relevant ad could outrank a bigger budget. Ads were kept clearly marked on the right-hand side of results, separate from organic links — a choice that also deflected the consumer-group protests pay-for-placement drew elsewhere.
In July 2005 Google added Quality Score, setting minimum bids from keyword relevance and ad performance rather than pure bid amount, and later folded landing-page quality into the algorithm. The auction became self-regulating: the same mechanism that priced clicks also rewarded the ads people actually wanted.
The result was a business model rather than a feature. Pay-per-click auctions became the standard for search advertising worldwide, and the product — renamed Google Ads in 2018 — grew into the revenue engine that funds the rest of Google.
Why it lands
- Billing per click aligned Google's revenue with advertiser results instead of page views.
- Ranking by bid × click-through made relevance part of the price, so good ads could outrank deep pockets.
- Self-serve signup removed the sales team, letting an ad program that began with about 350 advertisers reach the long tail of small business.
- Clearly marking paid links on the right avoided the consumer backlash Overture drew by blending paid listings into organic results.
What it did
Pay-per-click became the default business model of search advertising: rivals and later platforms copied the bid-plus-relevance auction, and the accountability it introduced — paying only when someone acts — is why search ads still dominate digital marketing budgets decades later.
What you can take
Change what you charge for, not just how much: charging on clicks aligned revenue with advertiser results, and ranking on relevance made the auction self-regulating — the design won.
Since then
AdWords Select became the template for search advertising; every major engine adopted bid-based, pay-per-click auctions. The quality-weighted ranking evolved into Quality Score in 2005 and later into the automated auctions behind Google's ad network. Renamed Google Ads in 2018, the product remains Google's core revenue engine, funding the company's search, cloud and AI bets.
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