CPC Inflation Driven by Pre-Auction Factors, Not Just Competition

Rising Cost-Per-Click (CPC) in paid search is increasingly driven by factors that occur before the auction begins, rather than solely by increased competition within the auction itself. These pre-auction influences include the emergence of AI Overviews, a decline in organic click volume, and the intensified competition from stronger brands vying for a reduced pool of commercial traffic. While optimizing bids and ad copy remains important, significant opportunities for efficiency are now found outside the traditional auction mechanics.

Paid search costs have seen a consistent climb across nearly all industry sectors. WordStream benchmarks indicate an average CPC of $5.42 across industries, more than double the figure from ten years ago. Stackmatix data shows year-over-year increases of 14-18% for Google Search and 18-22% for LinkedIn. Some advertisers are experiencing as much as a 25% inflation in their most critical commercial keywords. For a considerable period, organic search traffic served as a cost offset for pay-per-click (PPC) expenses. However, the advent of AI Overviews now captures clicks that previously contributed to paid search efficiency.

A recent zero-click study by Sparktoro revealed an 8% reduction in search engine clicks compared to 2025, directly impacting brands whose users now rely on AI summaries for information. Digiday's research, surveying brand and agency professionals, found that 37% of respondents have already observed a decrease in informational search traffic. This trend mirrors observations across client bases, intensifying pressure on navigational and transactional traffic to maintain its performance.

The number of advertisers participating in search auctions has grown by 35% year over year, a surge attributed to AI creative tools that have lowered the barrier to entry for new bidders. Google's AI Max for Search, in its initial year, has broadened the query space for advertisers willing to adopt it. Concurrently, it has concentrated competition within a more limited set of commercial queries. The consequence of fewer organic clicks reaching websites is increased reliance on paid auctions to compensate for the deficit. Furthermore, a greater number of advertisers competing for these remaining auctions inevitably leads to higher CPCs. Consequently, the auctions that still result in a click are becoming increasingly critical and expensive.