Alternate hypothesis: skyscrapers take a long enough time to build, are built frequently enough, and recessions/crashes happen often enough, that it's inevitable that there would be a few skyscrapers built during most recessions.
In order to link the building of skyscrapers to recessions/crashes, they'd have to show the inverse -- that fewer are built during financial good times. They don't mention that in the BBC article.
In order to link the building of skyscrapers to recessions/crashes, they'd have to show the inverse -- that fewer are built during financial good times. They don't mention that in the BBC article.