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Indeed, it is hard to say exactly how much wealth the internet creates, but it's a lot. E-commerce alone is $30 trillion industry; some estimates put the total economic value of the internet at $200 trillion or higher.

That said, this came too late for investors in the dot-com boom. AI investors may find themselves in a similar situation.

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And, perhaps more to this particular point, it came too late for vendors behind the dotcom boom. Lucent Technologies no longer exists. WorldCom no longer exists. Cisco is a shadow of its former self, with a stock price that only recovered last year.
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Cisco is a profitable company making useful products and services. The fact that we consider that a failure is damning.
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The dotcom bubble burst because the development of the internet could not keep up with expectations, even though investors were correct in principle with their assumption it would generate swaths of wealth. For AI the hope is that AI itself will start to push its own development and adoption sooner rather than later, so the timing issue that killed dotcom investors might instead make AI investors insanely rich. That's why we're still seeing heaps of money getting dumped into it.
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That’s a very charitable take.

Without smartphone, cellular networks etc you’d be miles off. Nobody had this in their thesis so they were plain wrong.

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It isn't exactly not a zero sum game either though. If you want to sell something you have to have willing buyers with either funds on hand or sufficient credit to make the purchase. So yeah that 6T gotta come from somewhere.
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