When we think of financial bubbles, we usually think of insane valuations and amateurs entering the market. Here is a video of how the emergence of skyscrapers as being an indicator.
On Skyscrapers, Vikram Mansharamani states, “Skyscrapers are a spectacular indicator. They are the manifestation of easy money, overconfidence, and hubris inaction.” The taller the skyscraper, the greater the indicator. The most recent instance of this was Dubai in 2007.