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Chip making giant Nvidia’s value hit $5 trillion US last week, a milestone that just a few years ago was unthinkable.

Two other tech giants have hit the $4 trillion US mark as excitement about the promise of AI drives investor interest. 

But in an uncertain world are the sky-high valuations sustainable, or a bubble that will soon bust? 

Today, the ABC’s chief business correspondent Ian Verrender on why this might not be a bubble that bursts like the dot-com crash of the early-2000s. 

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Ian Verrender, ABC Chief Business Correspondent