The Pace of Life (Scaling)
In 2006, Marc Bornstein's team measured pedestrian walking speeds across thirty-one cities on multiple continents. The finding was clean: people in larger cities walk faster. Not because they are in better physical condition, but because the city itself is faster. Subsequent research by West, Bettencourt, and colleagues incorporated this finding into a broader pattern. Walking speed was not an anomaly. The rate of economic transactions increases with city size. The speed of speech increases. The average duration of phone calls decreases. Patent production per capita accelerates. So does the rate of innovation, the turnover of businesses, the spread of ideas and infectious diseases alike. Everything moves faster in a bigger city — and the acceleration follows the same superlinear power law with exponent approximately 1.15 that governs economic output. The pace is not a cultural choice; it is a structural consequence of network density. This is the mathematical formalization of what Byung-Chul Han diagnosed as Rastlosigkeit — the inability to be present — and what AI intensifies beyond anything physical cities have produced.
In the AI Story
The pace-of-life scaling is one of West's most unsettling findings because it identifies the source of a pervasive modern psychological experience in structural geometry rather than cultural failure. The person who feels unable to slow down in a large city is not suffering from inadequate willpower. She is a biological organism — a system governed by sublinear scaling, with a metabolic rate optimized for ancestral environmental demands — embedded in a cognitive environment whose pace is scaling superlinearly.
The mismatch is not metaphorical. It is physiological. The stress hormones are real. The sleep disruption is real. The cardiovascular consequences are real. West's data shows that rates of cardiovascular disease, anxiety disorders, and other stress-related conditions scale superlinearly with city size — larger cities do not merely contain more sick people; they make people sick at a disproportionate rate, because the pace of life exceeds the biological design specifications of the organisms living it.
AI extends this mismatch beyond anything urban scaling data has previously captured. A developer spending sixteen hours in conversation with AI tools — building, iterating at a pace impossible without the tool — is operating at a cognitive density no city has ever achieved. Her innovation rate may be superlinear. Her cortisol level certainly is. The Berkeley researchers measured something consistent with West's predictions: workers using AI tools worked more, not less, and in previously protected intervals — lunch breaks, elevator rides, the micro-pauses that had served as informal cognitive rest.
This is the mathematical formalization of Rastlosigkeit, the restlessness that Byung-Chul Han identified as a cultural disease. Han's diagnosis was correct about the symptoms. West's framework corrects the causal attribution: the restlessness is not primarily ideological but structural — a mathematical consequence of inhabiting a system whose effective cognitive density is scaling superlinearly without bound.
The biological organism has stopping points: fatigue, sleep, declining marginal returns from a brain processing information for fourteen consecutive hours. These are sublinear constraints. The cognitive environment has no such constraints. AI does not tire. It does not lose focus at 3 a.m. It does not need to eat or walk away from the screen. The mismatch between sublinear biology and superlinear environment is, in West's framework, the central tension of the AI transition.
Origin
Bornstein's walking-speed research (1979, updated 2006) was the pioneering empirical finding. Bettencourt, West, and colleagues incorporated the pace-of-life pattern into their broader scaling framework in the 2007 PNAS paper and subsequent work, establishing the superlinear scaling of tempo as a universal feature of urban dynamics.
Key Ideas
Tempo scales with size. Walking speed, transaction rates, speech speed, and patent production all accelerate superlinearly with city size.
Structural, not cultural. The acceleration is a mathematical consequence of network density, not a product of ambition or anxiety.
Biological organisms strain. Rates of stress-related illness scale superlinearly, reflecting the mismatch between sublinear biology and superlinear environment.
AI exceeds cities. Cognitive density mediated by AI can exceed any physical city, extending the pace-of-life mismatch to new intensities.
No natural stopping points. Unlike biological systems with built-in fatigue, AI-augmented cognitive environments lack intrinsic limits on tempo.
Appears in the Orange Pill Cycle
Further reading
- Marc Bornstein, The pace of life: Revisited (1979, 2006)
- Bettencourt et al., Growth, innovation, scaling, and the pace of life in cities (PNAS, 2007)
- Geoffrey West, Scale (2017), chapter 8
- Byung-Chul Han, The Burnout Society (2015)