The document discusses the correlation between the completion of the world's tallest buildings and impending global economic crises. Specifically, it notes that the construction of tall skyscrapers tends to occur during late economic boom periods with high employment and resource use, but upon completion when the buildings are vacant or underleased, staffing is reduced causing high unemployment and recession. Examples given include the 1873 Equitable Life Building coinciding with the Long Depression, the 1907 completion of the Singer and Metropolitan Life buildings coinciding with the Bankers' Panic of 1907-1910, and the 2010 Burj Khalifa coinciding with the Great Recession of 2007-2010. The upcoming Kingdom Tower in Jeddah is also noted as potentially coinciding