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The Visibility Vacuum Theory: why GEO closes on a category-by-category timeline.
Capturing the #1 ChatGPT citation in your category costs roughly $400 to $600 today. In 24 months, the same position will cost $5,000 or more, and at that point you will not be capturing it. You will be paying to displace whoever got there first.
The cost differential most B2B SaaS founders haven't priced in
Open Vacuum
$400–600
Today
Capture · 90-day cycle
50–100×
cost increase
Closed Vacuum
$5,000+
In 24 months
Displacement · sustained campaign
TL;DR
The theory in six lines.
Every B2B SaaS founder running GEO investment in 2026 should be able to repeat these six points back after reading. Stage diagnosis is the first move. Everything else follows.
01
GEO is not evergreen. Each B2B SaaS category opens, fills, and closes its own Visibility Vacuum on a 24 to 36 month timeline.
02
Capture during Open Vacuum runs $400 to $600 per #1 citation. Displacement during Closed Vacuum runs $5,000 or more, a 50x to 100x increase.
03
A vacuum is open while four conditions hold: 30%+ YoY demand growth, fewer than 5 dominant cited sources, drifting category vocabulary, and missing comparison pages.
04
"Best CRM software" was unstable month-over-month in 2024 across DerivateX biweekly tracking. By Q1 2026 the top 5 had been stable for 9 straight months. The category closed in real time.
05
REsimpli captured #1 ChatGPT for real estate investor CRM in 90 days when that category was open. The same play is no longer available at any price in that category.
06
Two questions decide your next quarter. Is your category open or closed? And if closed, are you displacing the right position or pivoting to an adjacent vacuum?
The Problem
Most agencies are selling effort. Not timing.
Every GEO agency you talk to right now is telling you the same thing. The window is closing. Start now. Invest in citation engineering. Get cited before competitors do.
None of them are telling you which window. None of them can answer "is my specific category still open?" because none of them are tracking citation stability across a 12-month observation period. The "start now" advice is the same generic urgency you have heard for two years, and it has produced exactly the outcome you would expect: B2B SaaS marketing teams pouring effort into categories that closed 18 months ago, getting nothing back, and concluding GEO does not work.
GEO does work. You are running it in the wrong category at the wrong time.
The framework below tells you which categories are still open, what it costs to enter them, and what to do if your category has already closed. Run it before your next planning conversation.
The Closure Signal
What "best CRM software" tells you about category closure.
DerivateX has tracked top-5 cited sources for major B2B SaaS buyer queries biweekly since early 2024. This is what category closure looks like from the outside: source rotation collapsing into a stable set of five names, in roughly the same order, month after month.
2024 Q1
2024 Q3
2025 Q1
2025 Q3
2026 Q1
#1
Source C
Source D
Source A
Source A
Source A
#2
Source F
Source A
Source C
Source B
Source B
#3
Source A
Source G
Source B
Source C
Source C
#4
Source E
Source B
Source F
Source D
Source D
#5
Source B
Source C
Source G
Source E
Source E
By Q1 2026, the same five sources appeared in roughly the same positions across 9 consecutive months of tracking. The model has settled. Source preference bias has compounded. New entrants no longer get cited by publishing well-structured comparison content. They get ignored.
9 mo
stable
The Diagnosis
Four conditions decide whether your category is still open.
A Visibility Vacuum is open when all four hold simultaneously. Two failing means the vacuum is filling. Three failing means it is closed and only displacement-tier economics apply. Four hours of focused work answers the question.
01
Demand Growth Rate
> 30% YoY
The category's primary buyer queries must be growing in search volume. Flat or declining categories rarely produce vacuums because the model's category knowledge has settled.
Test: pull Google Trends and keyword tool data for the last 24 months. Score it.
02
Authority Gap
< 5 dominant sources
If 5 or more sources rotate through the top positions inconsistently, the gap is open. If the same 3 to 5 sources appear across 70%+ of responses, the gap is closing or closed.
Test: run 10 buyer queries 3 to 5 times each across ChatGPT, Perplexity, Claude, and Gemini. Tabulate cited sources.
03
Definitional Drift
3+ competing terms
Multiple terms compete for the same concept. The most underrated of the four conditions. LLMs cannot lock in canonical sources for a category whose name keeps changing.
Test: if three or more terms are in active use across review sites and industry publications, drift holds. If the vocabulary has consolidated, drift has closed.
04
Programmatic Whitespace
< 3 ranking pages
If fewer than 3 comprehensive ranking pages exist for "best [category]" queries, whitespace holds. If 5 or more strong pages exist, whitespace has closed.
Test: search G2, Capterra, and the top 5 industry publications for "best [category]" pages. Count them.
If you cannot run this assessment yourself, you do not understand your category well enough to invest GEO budget in it.
The Lifecycle
Four stages. One non-negotiable cost curve.
Every B2B SaaS category cycles through these four stages. Cost-per-citation rises 50x to 100x from Open to Closed, driven by source preference bias inside large language models. The figures are directional, derived from DerivateX engagement work and live displacement-tier rates.
Open Vacuum
0 to 12 months
~$400 to $600
cost-per-citation · capture
Push hard. Capture canonical citations on category-defining content.
Filling Vacuum
12 to 24 months
~$2k to $5k
5x to 10x · selective entry
Be selective. Target sub-categories where conditions still hold.
Closed Vacuum
24 to 36 months
~$5,000+
50x to 100x · displacement
Displace or pivot. One entrenched position, or jump to an adjacent vacuum.
Reset Event
36+ months
~$400 to $600
briefly reverts to capture
Move within 30 to 60 days of an external trigger event.
Three Reset triggers account for almost all re-openings: a major LLM model release retraining on different corpora, a new AI search interface gaining adoption, or a category redefinition where new vocabulary supersedes the old. Companies that move within 30 to 60 days of a reset capture disproportionate share. Companies that wait miss it.
Live Example
REsimpli: what Open Vacuum economics look like.
In 2024, real estate investor CRM was a textbook Open Vacuum. All four conditions held simultaneously. Inside that window, REsimpli captured the #1 ChatGPT citation for the category in 90 days using Citation Engineering on definition-forward category pages, comparison content, and named-entity reinforcement.
#1
ChatGPT citation captured for the category
90 days
from start to canonical citation status
$400–600
estimated cost-per-citation in Open stage
closed
category status today. The play is no longer available.
All four open-vacuum conditions held in 2024
✓
Demand growing as the segment professionalized
✓
No source dominance had formed in ChatGPT for the category
✓
Three competing terms in active use: wholesaler CRM, investor CRM, REI software
✓
G2 and Capterra had no clear category leaders
The Diagnostic
Where you are right now.
If you are reading this, you are in one of three positions. Run the four-condition assessment on your most important category and the answer is one of the cards below. Starting now is meaningless advice without knowing which one.
Position 01
Your category is open
All four conditions hold for your primary buyer queries. You are wasting the window every month you do not act. The brands that capture canonical citations in the next 6 to 12 months will be the brands AI models cite for the next 24 to 36 months at minimum.
The Move
Push hard. Capture canonical citations now, before cost-per-citation moves through Filling stage.
Position 02
Your category is filling
Two of the four conditions have failed. You can still capture sub-category positions if you move now and pick your fights carefully. Your window is shorter than you think, probably 6 to 9 months before sub-category positions also lock in.
The Move
Be selective. Target sub-categories where the four conditions still hold. Skip the parent.
Position 03
Your category is closed
Three or four conditions have failed. Your current GEO spend, if it is aimed at the parent category, is theater. The math says you are paying displacement-tier costs to chase positions incumbents will keep.
The Move
Displace one specific position with a sustained campaign, or pivot to an adjacent sub-category. Most should pivot.
FAQ
Common questions from operators.
The Visibility Vacuum Theory is a stage-based framework for timing GEO investment by category. It states that each B2B SaaS category produces a finite window during which capturing canonical AI citations is cheap, defined by four conditions: high demand growth, low authority concentration, definitional drift, and programmatic whitespace. As each condition fails, the vacuum moves through Open, Filling, Closed, and Reset stages. Cost-per-citation rises 50x to 100x from Open to Closed, driven by LLM source preference bias. The theory replaces "start now" advice with stage-aware investment thinking that tells founders when to push hard and when to pivot.
Run a 4-hour stage assessment on the four conditions. Check whether your category's primary buyer queries are growing 30%+ year-over-year. Test whether fewer than 5 dominant sources appear across 70%+ of AI assistant responses to 10 representative buyer queries. Confirm category vocabulary is still drifting across multiple competing terms. Audit whether definitive comparison pages on G2, Capterra, and major industry publications have not yet been built. All four holding means Open Vacuum. Two failing means Filling. Three or four failing means Closed and only displacement-tier economics apply.
For the parent categories, yes. Both "best CRM software" and "best marketing automation software" are in Closed Vacuum stage based on DerivateX biweekly citation tracking, with stable top-5 source sets across 6+ consecutive months. For sub-categories, often no. "Real estate investor CRM" or "marketing automation for B2B SaaS under 100 employees" can still be in Open or Filling stage even when the parent has closed. The right move is a sub-category stage assessment, not a parent-category one. Most companies in closed parent categories should be running sub-category pivots, not parent-category displacements.
Source preference bias. Once a large language model consistently cites a source for a category, it preferentially returns that source for related queries, including queries it has not seen before. The lock-in compounds: more citations produce more citations. New entrants in a closed category are not capturing whitespace. They are paying to displace incumbents who have the model's working memory of the category on their side. Displacement requires sustained original research, named expert positioning, third-party coverage in major publications, and aggressive entity reinforcement across community surfaces. None of that is cheap.
The Action
Run the four-condition assessment this week.
Block four hours. The output is a clear stage answer for your single most important category. Then make the call. Push, pivot, or displace. Do not run a fourth play. There isn't one.
01
Pick the one category that matters
The single category your business depends on most for revenue. Not three. One. The assessment scales, but the decision quality drops with each parallel category.
02
Score the four conditions
Demand growth, authority gap, definitional drift, programmatic whitespace. Each one is a yes or no answer backed by 30 to 60 minutes of research. Be honest with the answers.
03
Decide: push, pivot, or displace
Open means push. Filling means pivot to a sub-category. Closed means either displacement-tier sustained campaign or pivot. Match the move to the stage. Commit budget like the math is real, because it is.
Related Reading
Connected frameworks and data.
Most agencies sell effort. The question is timing. Diagnose the stage. Then commit budget like the math is real, because it is.