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The Skyscraper Index is a whimsical concept put forward by Andrew Lawrence, a property analyst at Dresdner Kleinwort Wasserstein in January 1999, which showed that the world's tallest buildings have risen on the eve of economic downturns. Business cycles and skyscraper construction correlate〔Thornton, p. 51〕 in such a way that investment in skyscrapers peaks when cyclical growth is exhausted and the economy is ready for recession.〔Thornton, p. 53〕 Mark Thornton's Skyscraper Index Model successfully sent a signal of the Late-2000s financial crisis at the beginning of August 2007. The buildings may actually be completed after the onset of the recession or later, when another business cycle pulls the economy up, or even cancelled.〔 Unlike earlier instances of similar reasoning ("height is a barometer of boom"),〔Willis, p. 167〕 Lawrence used skyscraper projects as a predictor of economic crisis, not boom. Careful statistical study has found that the height of buildings can ''not'' be used to accurately predict recessions or other aspects of the business cycle, but that GDP can predict the height of building construction.〔 ==Details== Lawrence started his paper, ''The Skyscraper Index: Faulty Towers'', as a joke (emphasized by a title referencing a comedy show〔) and based his index on comparison of historical data, primarily from the United States' experience. He dismissed overall construction and investment statistics, focusing only on record-breaking projects.〔 The first notable example was the Panic of 1907. Two record-breaking skyscrapers, the Singer Building and Metropolitan Life Insurance Company Tower, were launched in New York before the panic and completed in 1908 and 1909, respectively. Met Life remained the world's tallest building until 1913. Another string of supertall towers – 40 Wall Street, Chrysler Building, Empire State Building – was launched shortly before the Wall Street Crash of 1929. The next record holders, World Trade Center towers and Sears Tower, opened up in 1973, during the 1973–1974 stock market crash and the 1973 oil crisis. The last example available to Lawrence, Petronas Twin Towers, opened up in the wake of the 1997 Asian Financial Crisis and held the world height record for five years. Lawrence linked the phenomenon to overinvestment, speculation and monetary expansion but did not elaborate these underlying issues.〔 The concept was revived in 2005, when Fortune warily observed five media corporations investing in new skyscrapers on Manhattan〔 (none of them, including the tallest New York Times Building, broke any records). The intuitively simple concept, publicized by business press in 1999,〔Thornton, p. 53, reviews 1999 press coverage〕〔 p. 26〕 has been cross-checked within the framework of the Austrian Business Cycle Theory, itself borrowing on Richard Cantillon's eighteenth-century theories.〔Thornton, p. 52〕 Mark Thornton (2005) listed three ''Cantillon effects'' that make skyscraper index valid. First, a decline in interest rates at the onset of a boom drives land prices.〔Thornton, p. 62〕 Second, a decline in interest rates allows increase in average size of a firm, creating demand for larger office spaces. Third, low interest rates provide investment to construction technologies that enable developers to break earlier records. All three factors peak at the end of growth period.〔Thornton, p. 63〕 Critics dismissed the skyscraper index as an unreliable tool: the post-World War I recession, recession of 1937 and the early 1980s recession were not marked by any record-breaking projects.〔〔Thornton, p. 71〕 Construction of Woolworth Building (world height record 1913–1930) was marked by a local overbuilding crisis in New York City in 1913–1915〔Willis, p. 168〕 concurrent with a record construction boom in Chicago.〔Willis, p. 170〕 Thornton argues that completion of the Woolworth Building was followed by a third-worst-ever quarterly decline in gross domestic product, thus it should not be considered an exception from the rule (as Lawrence himself did).〔 Cyclical patterns in real estate have been thoroughly studied before Lawrence, notably by Homer Hoyt in the 1930s. A 1995 analysis of New York and Chicago experience by Carol Willis estimated that historically, two-thirds to three-quarters of skyscrapers were conceived for rent alone;〔Willis, p. 155–156〕 corporate "edifices" imposing their owners brand name (including most of historical record-holders) were a minority, and they too leased space to tenants.〔Willis, pp. 152–153〕 Speculative real estate markets cycle between two different behavior patterns.〔 In normal times when value of resources is predictable, performance of a building project can be estimated reliably through well-tested formulae. In boom times, rational pricing gives way to irrational buyers' behavior; buyers bet on ever-increasing demand and rents and are willing to pay more than they would normally.〔Willis, p. 157〕 Willis said that "height is a barometer of boom",〔 "the tallest buildings generally appear before the end of a boom, their height driven up by the speculative fever that affects both developers and lenders",〔 citing cyclically inflated land values as the principal factor for increases in building height,〔Willis, p. 166〕 but did not elevate this fact to become an "index". A related concept, Skyscraper Indicator, was popularized by Ralph Nelson Elliott in the 1930s.〔 pp. 375–376〕〔, pp. 212–213〕 In some ways this appears to be an elaboration of C. Northcote Parkinson's theory that only organizations in decline have sleek, well-planned buildings. His favorite example was, not a skyscraper, but the city of New Delhi (particularly the area now referred to as Lutyen's Delhi) – built shortly before India became independent of the British builders. The recently constructed Burj Dubai may join this list. In October 2009, construction company Emaar announced that it had completed the exterior of the building; within two months, the Dubai government came close to defaulting on its loans. Stephen Bayley from ''The Daily Telegraph'' commented, "For all the ambition of its construction, Dubai's new Dubai Tower is a frightening, purposeless monument to the subprime era." 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Skyscraper Index」の詳細全文を読む スポンサード リンク
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