- Received November 3, 2014.
- Accepted November 13, 2014.
- Published online April 22, 2015.
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© 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
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- 1Institute for New Economic Thinking at the Oxford Martin School, Oxford OX2 6ED, UK
- 2Mathematical Institute, University of Oxford, Oxford OX2 6GG, UK
- 3CABDyN Complexity Centre, University of Oxford, Oxford, UK
- 4Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA
- 5The William States Lee College of Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223, USA
- 6School of Sustainability, Arizona State University, Tempe, AZ 85281, USA