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Zappos and other advocates of Holocracy frequently state the following:

Research shows that every time the size of a city doubles, innovation or productivity per resident increases by 15 percent.

What research and what measures of innovation and productivity? Over what period of time? Did they control for inflation, general rise of GDP across the nation etc?

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up vote 14 down vote accepted

This claim stems from theoretical physicist and urban theorist Geoffrey West, portrayed in this NYT article. The paper is called Growth, innovation, scaling, and the pace of life in cities (PNAS 2007, doi: 10.1073/pnas.0610172104) and available online.

The indicators are listed in table 1 and clarified in the supporting information (extracts below).

It seems that the phrase every time the size of a city doubles is misleading: they found a correlation between city population and various metrics (number of patents, wages, GDP). They are not tracking the same city over a period of time. Thus the claim that is indeed supported by the study is: "If a city has twice the population of another city, it has also around 15 percent higher wages, GDP and number of patents granted per capita (if both cities are in the US, or both in Europe or both in China)."

  • New patents refers to number of new patents granted by the U.S. Patent and Trademark Office over the period of 1 year to authors residing in a given metropolitan statistical area. Inventors refers to number of patent authors over a given year, inferred from the same source.
  • Private R&D employment (U.S.) and private R&D establishments (U.S.) data are taken from the U.S. Economic Census, which provides information on the employment levels and number of establishments engaged in conducting original investigation undertaken on a systematic basis to gain new knowledge (research) and/or the application of research findings or other scientific knowledge for the creation of new or significantly improved products or processes (experimental development).
  • Total wages
  • GDP
  • “supercreative” professions are computer and mathematical; architecture and engineering; life, physical, and social science occupations; education; training and library; arts, design, entertainment, sports, and media occupations.
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3  
This is a good description of the method but doesn't fully address whether the headline question is strongly supported by the evidence. – matt_black Jan 24 at 12:55
    
@matt_black right, added a sentence to that regard. – mb21 Jan 24 at 14:13
6  
To be explicitly clear - one of the differences between the paper and the popular claim in the question is, the paper just reports correlation and doesn't say anything about causality. People seem to imply that increasing a city's size causes its residents to gain productivity/creativity, but it could equally be that such people move to larger cities, or a third factor (e.g. education) drives both productivity and urbanisation, or a mix, for example – user568458 Jan 24 at 16:00
3  
The paper links to non-existing sources for the numbers. Looking briefly into e.g. the GDP figures from Eurostat (by city), there seem to be absolutely no obvious correlation between the GDP/inhabitant and the number of inhabitants. – Tor-Einar Jarnbjo Jan 24 at 17:48

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