The S&P 500 would have to soar by an additional 25% to replicate the “irrational exuberance” that fueled the 90s tech bubble, according toSociete Generale analysts. What Happened: Analysts Manish Kabra and Alain Bokobza at Societe Generale wrote in a note on Wednesday, reported by Business Insider, “Applying the peak of the [technology-media-telecoms] bubble maths to the Nasdaq-100, the S&P 500 would have to reach 6,250 to price in the same level of irrational exuberance.” At the peak of the dot-com bubble, the tech sector was trading at twice its profit share of the S&P 500, and the benchmark…