Softbank CEO, Masayoshi Son, believes that Nvidia stock is undervalued despite its huge valuation.Son predicts that the chip business of Nvidia will greatly benefit from the increased spending on artificial intelligence (AI) over the next decade.He envisions artificial superintelligence by 2035, which would require approximately $9 trillion in spending.Son regrets selling Softbank's 4.9% stake in Nvidia in 2019, as it would be worth over $160 billion today.