Name: Critical Mass
ISBN: 9780374530419

Philip Ball

Ball shows how much can be understood of human behavior when we cease to predict and analyze the behavior of individuals and instead look to the impact of individual decisions--whether in circumstances of cooperation or conflict--on our laws, institutions and customs.

How One Thing Leads to Another

Critical Mass

Gavin

"Being an Enquiry into the Interplay of Chance and Necessity in the Way That Human Culture, Customs, Institutions, Cooperation and Conflict Arise" (2004) by Philip Ball.


An elegant pop treatment of the once-burgeoning physics of mass human behaviour. (Which physics follows hundreds of years of stupid and/or inhumane theories claiming the name "social physics"). A love letter to statistical mechanics:

  Most people who have encountered thermodynamics blanch at its mention, because it is an awesomely tedious discipline both to learn theoretically and to investigate experimentally. This is a shame, because it is also one of the most astonishing theories in science. Think of it: here is a field of study initiated to help nineteenth-century engineers make better engines, and it turns out to produce some of the grandest and most fundamental statements about the way the entire universe works. Thermodynamics is the science of change, and without change there is nothing to be said...

Tools, methods and ideas developed to understand how the blind material fabric of the universe behaves are finding application in arenas for which they were never designed, and for which they might at first glance appear ridiculously inappropriate. Physics is finding its place in a science of society.

Introduces a hundred topics from thermodynamics, economics, econophysics, game theory, and fields which don't have a name yet, including intuitive explanations of fearsome concepts like: 
 
 self-organized criticality  the 2D and 3D Ising model  diffusion-limited aggregation in bacteria and cities  Lévy-stability  the business cycle  random walks  superfluidity and supercooling phase transitions  bifurcation theory  traffic flow  Zipf's law  the Small world phenomenon  catastrophe theory ... 
 
Unlike shiny TED-style nonfiction, he refers directly to the original scientific papers and includes small interviews with the original researchers. No equations, but beautiful diagrams relating micro with macro, too: snowflakes to traffic and bacterial colonies to cities.

The book's reception, in the main by middlebrow, mathematically illiterate reviewers shocked me a bit: their banner conclusions were "boo! people aren't particles!!", a truism which Ball spends much of the book thinking about, and "aaar horrible people have said they've found the laws of society before!!", a truism the first fifth of the book is a history of. In their haste to protect ordinary human difference from averages, and the notion of free will from technical explanations, they flee to safe refuges like "complexity" and "reflexivity", i.e. out of science. Ball can speak for himself though:
The notion that we could ever construct a scientific "utopia theory" [e.g. classical Marxism] is, then, doomed to absurdity. Certainly, a "physics of society" can provide nothing of the sort. One does not build an ideal world from scientifically based traffic planning, market analysis, criminology, network design, game theory, and the gamut of other ideas discussed in this book. Concepts and models drawn from physics are almost certainly going to find their way into other areas of social science, but they are not going to provide a comprehensive theory of society, nor are they going to make traditional sociology, economics, or political science redundant. The skill lies in deciding where a mechanistic, quantitative model is appropriate for describing human behavior, and where it is likely to produce nothing but a grotesque caricature. This is a skill that is still being acquired, and it is likely that there will be embarrassments along the way. 

But properly and judiciously applied, physical science can furnish some valuable tools in areas such as social, economic, and civic planning, and in international negotiation and legislation. It may help us to avoid bad decisions; if we are lucky, it will give us some foresight. If there are emergent laws of traffic, of pedestrian motions, of network topologies, of urban growth, we need to know them in order to plan effectively. Once we acknowledge the universality displayed in the physical world, it should come as no surprise that the world of human social affairs is not necessarily a tabula rasa, open to all options.

Society is complex but that does not place it beyond our ken. As we have seen, complexity of form and organization can arise from simple underlying principles if they are followed simultaneously by a great many individuals.
There is a real question about how deep into human behaviour the statistical approach can go. Econophysics, as a term and as a living, funded academic subfield, fizzled out shortly after this book was published. Apparently the SOC results have come in for a lot of criticism, though mostly of their overreach than the method being humanistically inapplicable or whatevs.

Even so, I wish I had read this 5 years ago: it would have saved me lots of contortions. it taught me a huge amount anyway. (e.g. the huge moral panic, following the invention of descriptive statistics, about ever using means to describe any human characteristics, since the remarkable stability of e.g. the C17th London crime rate across decades seemed to speak of divine or diabolical insurance.) One of my top 5 books on economics, one of my top 5 books on physics.

In one sentence: Social physics had at last begun to make exciting progress on understanding mass human behaviour.

Critical Mass How One Thing Leads to Another