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Buffett is about to step down as Berkshire's chief executive. Analysts are speculating this investment may offer a pre-retirement clue about where durable profits in the digital economy could come from.

Buffett's record of picking winners with 'moats'

Buffett has picked many winners over the decades, from American Express to Coca Cola.

Yet he has long expressed skepticism toward technology businesses. He also has form in getting big tech bets wrong, most notably his underwhelming investment in IBM a decade ago.

With Peter Thiel and Japan's richest man Masayoshi Son both recently exiting Nvidia, it may be tempting to think the “Oracle of Omaha” is turning up as the party is ending.

But that framing misunderstands Buffett's investment philosophy and the nature of Google's business.

Buffett is not late to AI. He is doing what he's always done: betting on a company he believes has an“economic moat”: a built-in advantage that keeps competitors out.

His firm's latest move signals they see Google's moat as widening in the generative-AI era.

Two alligators in Google's moat

Google won the search engine wars of the late 1990s because it excelled in two key areas: reducing search cost and navigating the law.

Over the years, those advantages have acted like alligators in Google's moat, keeping competitors at bay.

Google understood earlier and better than anyone that reducing search cost – the time and effort to find reliable information – was the internet's core economic opportunity.

Google founders Sergey Brin and Larry Page in 2008, ten years after launching the company. Photo: Joi Ito/Wikimedia Commons, CC BY

Company founders Sergey Brin and Larry Page started with a revolutionary search algorithm. But the real innovation was the business model that followed: giving away search for free, then auctioning off highly targeted advertising beside the results.

Google Ads now brings in tens of billions of dollars a year for Alphabet. But establishing that business model wasn't easy. Google had to weave its way through pre-internet intellectual property law and global anxiety about change.

The search giant has fended off actions over copyright and trademarks and managed international regulatory attention, while protecting its brand from scandals.

These business superpowers will matter as generative AI mutates how we search and brings a new wave of scrutiny over intellectual property.

Berkshire Hathaway likely sees Google's track record in these areas as an advantage rivals cannot easily copy.

What if the AI bubble bursts?

Perhaps the genius of Berkshire's investment is recognizing that if the AI bubble bursts, it could bring down some of the“magnificent seven” tech leaders – but perhaps not its most durable members.