s152.

As for barter, the formula is n(n-1)/2, where n is the number of towns, so the exact number for direct links between 1,000 towns is 499,500 two-way flights. For hub-based links it is simply 2(n-1)/2, or 999 two-way flights. For a more normal distribution—with, say, each town being linked four ways with the nearest four towns, the number of two-way links rises at the rate of 2n, less the smaller number of links maintained by towns near the edge of the system—and those edges may be expected to be irregular, with some towns having only one link.

David Fleming
Dr David Fleming (2 January 1940 – 29 November 2010) was a cultural historian and economist, based in London, England. He was among the first to reveal the possibility of peak oil's approach and invented the influential TEQs scheme, designed to address this and climate change. He was also a pioneer of post-growth economics, and a significant figure in the development of the UK Green Party, the Transition Towns movement and the New Economics Foundation, as well as a Chairman of the Soil Association. His wide-ranging independent analysis culminated in two critically acclaimed books, 'Lean Logic' and 'Surviving the Future', published posthumously in 2016. These in turn inspired the 2020 launches of both BAFTA-winning director Peter Armstrong's feature film about Fleming's perspective and legacy - 'The Sequel: What Will Follow Our Troubled Civilisation?' - and Sterling College's unique 'Surviving the Future: Conversations for Our Time' online courses. For more information on all of the above, including Lean Logic, click the little globe below!

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