What the 'Crane Index' Says About Your Changing City(citylab.com)
citylab.com
What the 'Crane Index' Says About Your Changing City
https://www.citylab.com/life/2019/09/building-construction-tower-crane-san-francisco-skyscrapers/589495/
2 comments
There's another crane index, which is how many tower cranes you need to build one building. Google's is 6; I think they're among the world's least efficient builders.
Perth, Australia, count the cranes has been a pretty good indicator for 40 years now.