In 1928, construction on the world’s tallest building began in New York: the Bank of Manhattan Trust Building at 40 Wall Street. Today, it’s “The Trump Building.”

When its developers learned that the Chrysler Building would be even taller, they added three stories to the Manhattan Building to secure the title of “world’s tallest.” Then the Chrysler Building came along and added a giant spire, beating it by just over a hundred feet.

Of course, that didn’t last long either. Each of these buildings held the title for less than a year before the Empire State Building topped out at 1,454 feet, more than 400 feet taller than the other two.

And then: the economy collapsed.

The Great Depression hit.

And it took decades for the global economy to recover – and it wasn’t until the 1970s before a taller building emerged.

Those buildings were the Twin Towers in the early 1970s, and the Sears Tower in Chicago in ’73. And then, right on cue, another major recession hit in the middle of the decade.

Notice a pattern?

It is no coincidence that in both cases, the construction of major buildings coincided with long-term economic peaks. It happened in the 1930s and again in the 1970s.

Historically, there have been clear peaks in skyscrapers when the economy is at a high. It’s like when the party’s raging and the whole world thinks the economy will never go down, these mammoth hunks of steel pop out of the ground as if to say the high will go on forever!

And I haven’t even said a word about where we are today…

106.

That’s how many skyscrapers popped up around the world in 2015. It’s the largest number completed in a single year on record. Before this decade, it was usually around 20 or 30. Now it’s up to five times that!

Oh, but it gets better!

The Council on Tall Buildings and Urban Habitat expects 135 skyscrapers to be finished in 2016, and another 140 in 2017.