Did Stand on Zanzibar come true?
Brunner hit the headcount almost to the year, and his lone 'muckers' and corporate super-brain are now ordinary news. His one big structural miss is who does the genetic sorting: not the state with a licence, but the market with a price list.
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How this P(n) was calculated
Each prediction is weighted 1–5 by how pivotal it is to the story: 5 is the core premise, 1 is background detail. Arrived scores 1, arriving 0.5, everything else 0. P(n) is the weighted points divided by the total weight.
| Claim | Prediction · why this weight | Weight | Status | Value | Points |
|---|---|---|---|---|---|
| SOZ-1 | The world's population reaches about seven billion by 2010. Core premise: seven billion crowded people is the title's sum and the pressure behind every strand. |
5 | ARRIVED | 1 | 5 |
| SOZ-2 | Random mass killings by lone attackers ('muckers') become a routine category of news. Supporting: muckers recur through the collage as a symptom of overcrowding, shaping the world's mood. |
3 | ARRIVED | 1 | 3 |
| SOZ-3 | The most powerful computers belong to a private corporation and sit at the centre of its business and its dealings with governments, as General Technics' Shalmaneser does. Major: Shalmaneser sits at the centre of General Technics' Beninia scheme, one of the two main plots. |
4 | ARRIVED | 1 | 4 |
| SOZ-4 | The state passes eugenic laws that decide, on genetic grounds, who is allowed to have children. Supporting: eugenic breeding laws make Yatakang's genetic-engineering claim explosive and drive Hogan's mission. |
3 | DIVERGED | 0 | 0 |
| Total | 15 | 12 |
P(n) = 12 ÷ 15 = 80% · unweighted average 75%
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SOZ-1
The world's population reaches about seven billion by 2010.
Weight 5/5 · Core premise: seven billion crowded people is the title's sum and the pressure behind every strand.
The UN marked the seven-billionth person on 31 October 2011, a year after Brunner's setting. The number was right; the mood around it was not. Fertility has since fallen to about 2.25 births per woman worldwide and the UN now expects a peak of roughly 10.3 billion in the 2080s, so the endlessly swelling crowd the novel extrapolates from is flattening out. 123
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SOZ-2
Random mass killings by lone attackers ('muckers') become a routine category of news.
Weight 3/5 · Supporting: muckers recur through the collage as a symptom of overcrowding, shaping the world's mood.
In the US, the FBI counted 160 active-shooter incidents between 2000 and 2013, rising from an average of 6.4 a year in the first seven years to 16.4 in the last seven. Brunner did not invent the phenomenon: the University of Texas tower shooting was in 1966, two years before publication. What he foresaw was its normalisation as a recurring news item. The arrival year marks the step-change in the FBI series and is a judgement call. 45
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SOZ-3
The most powerful computers belong to a private corporation and sit at the centre of its business and its dealings with governments, as General Technics' Shalmaneser does.
Weight 4/5 · Major: Shalmaneser sits at the centre of General Technics' Beninia scheme, one of the two main plots.
Epoch AI estimates that industry's share of AI supercomputer performance rose from about 40% in 2019 to 80% in 2025, and names xAI's Colossus the most performant AI supercomputer as of March 2025. On the traditional TOP500 benchmark, government laboratories still hold the top three places, so the handover is complete for AI computing but not for scientific supercomputing. 67
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SOZ-4
The state passes eugenic laws that decide, on genetic grounds, who is allowed to have children.
Weight 3/5 · Supporting: eugenic breeding laws make Yatakang's genetic-engineering claim explosive and drive Hogan's mission.
No democracy licenses parenthood by genome, and the largest state birth-control regime, China's one-child policy, was based on numbers rather than genes and ended in 2015. Genetic selection arrived anyway, by the private route: US firms sell whole-genome and polygenic embryo screening to IVF patients, and one was filmed marketing selection for predicted IQ. Europe's geneticists call polygenic embryo scoring unproven and unethical. The sorting happened, but through a price list rather than a statute. 8910
- FOR State of World Population 2011: People and Possibilities in a World of 7 Billion. UNFPA, 2011. States that seven billion people will inhabit the earth as of 31 October 2011.
- AGAINST Population | United Nations. United Nations, 2024. Projects a peak of about 10.3 billion by the mid-2080s, with global fertility falling towards replacement; the growth curve the novel extrapolates is bending.
- CONTEXT World population projected to reach 9.8 billion in 2050, and 11.2 billion in 2100. UN DESA, 2017. The 2017 projection, since revised downward, shows how recently the never-ending-growth picture was still official.
- FOR A Study of Active Shooter Incidents in the United States Between 2000 and 2013. Federal Bureau of Investigation / Texas State University, 2014-09. 160 incidents; the annual average rose from 6.4 to 16.4 between the study's first and last seven years.
- CONTEXT Mass Shooter Database. The Violence Prevention Project, 2025. Tracks US mass shootings from 1966 onward, a reminder that the novel was extrapolating from events already in the news.
- FOR Trends in AI supercomputers. Epoch AI, 2025-04-23. Industry's share of AI supercomputer compute rose from about 40% (2019) to 80% (2025); the public sector fell below 20%.
- AGAINST TOP500 List, June 2025. TOP500, 2025-06. El Capitan, Frontier and Aurora, all US Department of Energy laboratory machines, hold the top three places.
- AGAINST China to end one-child policy and allow two. BBC News, 2015-10-29. The world's biggest state limit on births is relaxed, and it was never genetic.
- CONTEXT US startup charging couples to 'screen embryos for IQ'. The Guardian, 2024-10-18. Heliospect marketed embryo ranking at up to $50,000 for 100 embryos; selecting for IQ is illegal in the UK but not in the US.
- AGAINST The use of polygenic risk scores in pre-implantation genetic testing: an unproven, unethical practice. European Journal of Human Genetics, 2021-12-17. European geneticists argue against polygenic embryo scoring on scientific and ethical grounds.
Ledger updated 1 Nov 2026. All works on the P(n) Board · Method