‘Nobody knows anything’ and ‘this time is different’: the phrases that define — and haunt — the AI economy
The phrases 'this time is different' and 'nobody knows anything' are prevalent in discussions about the current AI economy, reflecting uncertainty and the potential for a financial bubble. Experts like Ethan Mollick emphasize that there is no definitive playbook for navigating AI's impact on productivity and the economy. Current estimates suggest AI is only marginally improving productivity, raising questions about its future economic implications.
- ▪The phrase 'this time is different' signals investor rationalization of high valuations, often leading to financial folly.
- ▪Ethan Mollick stated that in the AI sector, 'nobody knows anything,' highlighting the uncertainty in the industry.
- ▪Bank of America estimates AI currently boosts economy-wide productivity by only 0.1%.
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There are two phrases that have reliably marked every great financial bubble in modern history.Recommended Video The first is “this time is different” — what Sir John Templeton called “among the four most costly words in the annals of investing,” the signal that investors have begun rationalizing sky-high valuations by convincing themselves that old metrics no longer apply. Carmen Reinhart and Kenneth Rogoff gave the phrase its academic weight in their landmark 2009 book This Time Is Different: Eight Centuries of Financial Folly, documenting how governments and investors had repeatedly convinced themselves that past crises wouldn’t recur — and were always proven wrong.
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