Glossary · Marketing Strategy
Creative Fatigue
also: ad fatigue · entropy-based creative decay
Definition
Creative fatigue is the decay of advertising performance as the same creative is repeatedly shown to the same audience. Entropy-based detection metrics identify the inflection point earlier than CTR decline — typically 40–60% through the CTR curve — enabling proactive rotation before wasted spend accumulates.
Creative ad performance follows a predictable decay: the first impressions generate outsized response, the hundredth impression generates minimal response. Classical monitoring uses CTR or conversion-rate decline, both lagging. Entropy-based detection treats the audience-creative matching as a distribution and flags fatigue when the distribution's entropy drops — fewer audiences are responding. This signal precedes performance collapse by 2–4 weeks, enabling proactive creative rotation.
Essays on this concept
- Digital Economics
Attention Economics Quantified: Measuring the True CPM of Cognitive Load in Digital Advertising
CPM measures whether an ad loaded in a browser. It says nothing about whether a human noticed it. Here's a framework for pricing what actually matters — the cognitive cost of attention — and why the gap between CPM and true attention cost is where billions in ad spend disappear.
- Marketing Strategy
Brand vs. Performance: A Portfolio Optimization Framework Using Markowitz Theory for Marketing Budget Allocation
Finance solved the allocation problem in 1952. Marketing still argues about it in 2026. Markowitz's portfolio theory — applied to marketing channels instead of stocks — reveals an efficient frontier that makes the brand-versus-performance debate quantitatively resolvable.
- Marketing Engineering
Creative Fatigue Detection Using Entropy Metrics: An Automated Framework for Ad Refresh Cycles
By the time your dashboard shows declining CTR, creative fatigue has already cost you weeks of wasted spend. Shannon entropy applied to engagement signals detects fatigue 11 days earlier than traditional frequency caps.
- Marketing Engineering
The Hidden Cost of Optimization: How Over-Fitted Algorithms Destroy Long-Term Brand Equity
Your bidding algorithm gets better every quarter. Your brand gets weaker every year. This is not a coincidence — it's Goodhart's Law applied to marketing, and the compounding damage is invisible until it's too late.
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