Marchetti’s constant

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pages: 603 words: 182,781

Aerotropolis by John D. Kasarda, Greg Lindsay

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3D printing, air freight, airline deregulation, airport security, Akira Okazaki, Asian financial crisis, back-to-the-land, barriers to entry, Berlin Wall, big-box store, blood diamonds, borderless world, British Empire, call centre, carbon footprint, Cesare Marchetti: Marchetti’s constant, Clayton Christensen, cleantech, cognitive dissonance, commoditize, conceptual framework, credit crunch, David Brooks, David Ricardo: comparative advantage, Deng Xiaoping, deskilling, digital map, edge city, Edward Glaeser, failed state, food miles, Ford paid five dollars a day, Frank Gehry, fudge factor, full employment, future of work, Geoffrey West, Santa Fe Institute, George Gilder, global supply chain, global village, gravity well, Haber-Bosch Process, Hernando de Soto, hive mind, if you build it, they will come, illegal immigration, inflight wifi, intangible asset, interchangeable parts, Intergovernmental Panel on Climate Change (IPCC), intermodal, invention of the telephone, inventory management, invisible hand, Jane Jacobs, Jeff Bezos, Kangaroo Route, knowledge worker, kremlinology, labour mobility, Marchetti’s constant, Marshall McLuhan, Masdar, mass immigration, McMansion, megacity, Menlo Park, microcredit, Network effects, New Economic Geography, new economy, New Urbanism, oil shale / tar sands, oil shock, peak oil, Pearl River Delta, Peter Thiel, pets.com, pink-collar, pre–internet, RFID, Richard Florida, Ronald Coase, Ronald Reagan, Rubik’s Cube, savings glut, Seaside, Florida, Shenzhen was a fishing village, Silicon Valley, Silicon Valley startup, Skype, smart cities, smart grid, South China Sea, South Sea Bubble, sovereign wealth fund, special economic zone, spice trade, spinning jenny, stem cell, Steve Jobs, supply-chain management, sustainable-tourism, telepresence, the built environment, The Chicago School, The Death and Life of Great American Cities, The Nature of the Firm, thinkpad, Thomas L Friedman, Thomas Malthus, Tony Hsieh, trade route, transcontinental railway, transit-oriented development, traveling salesman, trickle-down economics, upwardly mobile, urban planning, urban renewal, urban sprawl, walkable city, white flight, white picket fence, Yogi Berra, zero-sum game

When he finished Peachtree Center in 1976, the result was a hermetically sealed “Center” central to nothing except its clones elsewhere. He had built the urban equivalent of a hub, profitable and infinitely repeatable anywhere. And with that, his LEGO-block approach became the reigning vernacular in Airworld’s peculiar geography of nowhere. Kasarda’s Law and Marchetti’s Constant It wasn’t supposed to be this way. Technology was going to ground us by linking and shrinking the world, and in doing so set us free. The world would flatten. Road warriors would beat their platinum medallions into plowshares. It hasn’t happened. For twenty years, we’ve heard how e-mail and videoconferencing— relabeled “telepresence”—would eliminate the need for cross-country meetings.

But as horse trams came along, followed by electric trams, then subways, and finally cars, the city’s periphery raced away from its Enlightenment-era core. Berlin’s diameter was effectively ten times wider in 1950 than it was 150 years earlier, yet it still took only an hour to traverse. The rule has since been dubbed Marchetti’s Constant. Marchetti contended that transportation, not communications, was the “unifying principle of the world.” Ratifying Kasarda’s Law, he attested that the “so-called explosion in communication during the last 20 years did not dent transportation expansion; on the other hand, they tend to move together.”

A group called the Future Forum predicted there will be 1.5 million people working in the U.K. but living overseas by 2016, commuting daily or weekly between London and Barcelona, Marrakech, Dubrovnik, Verona, Palma, Pula, and Valencia. Dallas residents know the drill. Started here in 1973, Southwest Airlines was the template for Ryanair and every low-fare carrier since. The combination of deregulation, cheap tickets, and gratuitous expense accounts has brought air travel well within range of Marchetti’s Constant, hence consultant expresses and Jim Tam’s perambulating across Texas. Consider Angela Kim, who commutes from Houston to Dallas every Tuesday to babysit her grandson for a few days while her daughter the physician pulls back-to-back shifts for her residency. Occasionally she lands, scoops him up at the curb, and boards the next 250-mile, fifty-five-minute flight back to Dallas.


pages: 578 words: 168,350

Scale: The Universal Laws of Growth, Innovation, Sustainability, and the Pace of Life in Organisms, Cities, Economies, and Companies by Geoffrey West

Alfred Russel Wallace, Anton Chekhov, Benoit Mandelbrot, Black Swan, British Empire, butterfly effect, carbon footprint, Cesare Marchetti: Marchetti’s constant, clean water, complexity theory, computer age, conceptual framework, continuous integration, corporate social responsibility, correlation does not imply causation, creative destruction, dark matter, Deng Xiaoping, double helix, Edward Glaeser, endogenous growth, Ernest Rutherford, first square of the chessboard, first square of the chessboard / second half of the chessboard, Frank Gehry, Geoffrey West, Santa Fe Institute, Guggenheim Bilbao, housing crisis, Index librorum prohibitorum, invention of agriculture, invention of the telephone, Isaac Newton, Jane Jacobs, Jeff Bezos, Johann Wolfgang von Goethe, John von Neumann, Kenneth Arrow, laissez-faire capitalism, life extension, Mahatma Gandhi, mandelbrot fractal, Marchetti’s constant, Masdar, megacity, Murano, Venice glass, Murray Gell-Mann, New Urbanism, Peter Thiel, profit motive, publish or perish, Ray Kurzweil, Richard Feynman, Richard Feynman, Richard Florida, Silicon Valley, smart cities, Stephen Hawking, Steve Jobs, Stewart Brand, technological singularity, The Coming Technological Singularity, The Death and Life of Great American Cities, the scientific method, too big to fail, transaction costs, urban planning, urban renewal, Vernor Vinge, Vilfredo Pareto, Von Neumann architecture, Whole Earth Catalog, Whole Earth Review, wikimedia commons, working poor

This surprising observation of the approximately one-hour invariant that communal human beings have spent traveling each day, whether they lived in ancient Rome, a medieval town, a Greek village, or twentieth-century New York, has become known as Marchetti’s constant, even though it was originally discovered by Zahavi. As a rough guide it clearly has important implications for the design and structure of cities. As planners begin to design green carless communities and as more cities ban automobiles from their centers, understanding and implementing the implied constraints of Marchetti’s constant becomes an important consideration for maintaining the functionality of the city. 4. THE INCREASING PACE OF WALKING Zahavi and Marchetti presumed that for a given mode of transportation, such as walking or driving, travel speed did not change with city size.

., 48–49 life expectancy (life span), 6, 11–12, 183–94, 457n estimated gain in, if given disease was cured, 193, 193–94 human mortality curve, 189–90, 192, 192–94, 193 human survivorship curves, 189–94, 191, 192 maximum, 6, 24, 188–94, 202–3 temperature dependence of, 175, 176, 177, 203–4 life extension, 6, 183–94, 203–7 body temperature and, 203–4 caloric restriction and, 205–7, 206 heartbeats and pace of life, 204–5 Limehouse (London), 224–26 Limits to Growth, The (Meadows), 231–32 linear thinking, 17–18, 44–45, 72, 157 links and social networks, 297–98, 298, 319–20 Liverpool, walking lanes, 335–36, 336 Living Earth Simulator, 271 Lobo, José, 274–75, 356, 364, 386 logarithms, 26, 47–48, 49 London, 222–26, 267–68 garden cities, 255 growth curve, 376 Longevity Prize, 184 Los Alamos National Laboratory, 83–84, 106, 274, 405, 434, 435 Los Angeles, 17–18, 251, 310 growth curve, 377 infrastructure networks, 252 Lösch, August, 290 Lower Manhattan Expressway, 260 LSD, 52–54 MacBook Air, 439, 445 machine learning, 443–44 macroecology, 105 magic number four, 6, 117 self-similarity and origin of, 126–30 universality and, 93–99 maintenance expenses, 391–93 Malthus, Thomas Robert, 227–30, 287, 414–15, 416, 423 Malthusians, 227–30, 414–15 mammals. See animals Manchester, England, 223–24 Mandelbrot, Benoit, 130–31, 132, 138–45, 152, 364 Mandelbrot set, 143–44 manufacturing, 211 Marchetti, Cesare, 333–35 Marchetti’s constant, 334–35 market capitalization, 379, 389–90 market share, 408–9 Marx, Karl, 228, 332 Masdar (Abu Dhabi), 256, 258, 299 Mathematical Principles of Natural Philosophy (Newton), 181 mathematics, 8 biology and, 85–86, 87 Euclidean geometry, 130–31, 141–42 matryoshka, 128 maximal Krogh radius, 160 maximum life span, 6, 188–94, 202–3 maximum size of animals, 158–63 Maxwell, James Clerk, 109, 115, 428 McCarthy, Cormac, 425 McKinsey & Company, 404, 405 McMahon, Thomas, 198 Mead, Margaret, 239 Meadows, Dennis, 231–32 measurement process, 135–41 mechanical constraints, 122, 158–63 mechanistic theory, 12, 85, 111–12, 144, 145, 182, 408 Medawar, Peter, 86 medical research, 52–55 Medical Research Council Unit (MRCU), 437 medicine, scaling in, 16, 51–57 megacities, 7, 215, 223–24, 267–68 Meier, Paul, 403 mergers and acquisitions, 33, 403–4 survivorship curves, 396–97, 399 metabolic energy emergent laws and hierarchy of life, 99–103 growth and, 165–66 metabolic rate, 13, 18–19, 124–26, 201, 234 of animals, 2, 2n, 3, 13, 18–19, 25–26, 91–92, 285–86 of average human, 88–89 of bacteria and cells, 93, 94, 96 of companies, 391–92 definition of, 13 Kleiber’s law and, 26–27, 90–93, 117, 145 in mammals, plants, and trees, 18–19, 118–22 natural selection and, 88–90, 151 scaling of, 90–91, 173 metabolic theory of ecology (MTE), 115–16, 173–78, 203–4 metabolism of cities, 371–78 energy, and entropy, 12–15 social, 13, 373–74, 415 Metabolism (architecture), 247–48 metaphysics, 179–80 Metropolitan Statistical Areas (MSAs), 356, 462n Mexico City, growth curve, 375 mice, 6, 12, 16, 52, 114 caloric restriction and survival curves, 205, 206 Milgram, Stanley, 296–97, 301–4 Milgram experiment, 301–2 Milky Way, 79 Millennium Bridge (London), 298–300 minimum size of animals, 155–58 mitochondria, 100–102, 101, 113 mobile phone data, as detector of human behavior, 337–45, 351–52, 439 modeling, 62–63 modeling theory, 35, 71–75 Modena, Italy, 249 momentum, 20–21 Moore, James, 249 mortality.


pages: 352 words: 104,411

Rush Hour by Iain Gately

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Albert Einstein, autonomous vehicles, Beeching cuts, blue-collar work, British Empire, business intelligence, business process, business process outsourcing, call centre, car-free, Cesare Marchetti: Marchetti’s constant, Clapham omnibus, cognitive dissonance, congestion charging, connected car, corporate raider, DARPA: Urban Challenge, Dean Kamen, decarbonisation, Deng Xiaoping, Detroit bankruptcy, don't be evil, Elon Musk, extreme commuting, Google bus, Henri Poincaré, Hyperloop, Jeff Bezos, low skilled workers, Marchetti’s constant, postnationalism / post nation state, Ralph Waldo Emerson, remote working, self-driving car, Silicon Valley, stakhanovite, Steve Jobs, telepresence, Tesla Model S, urban planning, éminence grise

The similarity in daily travel time between such radically different lifestyles inspired Cesare Marchetti, the Venetian theoretical physicist, to suggest that there was a ‘quintessential unity of travelling instincts around the world’ and that this unity resulted in a fixed ‘travel time budget’ that he named after himself as Marchetti’s Constant. He tested his theory against a variety of cultures past and present and decided that it has shaped our behaviour since the dawn of history. The territory associated with ancient Greek villages, for instance, whose inhabitants went about on foot, was about twenty square kilometres, which was about as much as they could manage within their travel time budget, and this pedestrian limit continued to restrict the size of towns and settlements until the Industrial Revolution.