MarketsEquity MarketsAIOpinionThe threat to AI stock mania is not so much lack of electricity, but rather the global bottleneck of transformers, substations, switchgear, transmission lines and all the unsexy stuff we rarely think about.Ambrose Evans-PritchardGlobal economy commentatorMarket manias have patterns. The most powerful ones are genuine technological revolutions pushed far beyond rational limits by crowd psychology.By mid-1999 it was already clear to veteran investors and students of economic history that the dotcom bubble had reached parabolic insanity.The Telegraph LondonSubscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Latest In Equity marketsFetching latest articlesMost Viewed In Markets