If output is your KPI, you should certainly define it precisely. If purely net worth, Musk isn't the 'most productive' because he simply isn't the richest pers

If output is your KPI, you should certainly define it precisely. If purely net worth, Musk isn't the 'most productive' because he simply isn't the richest person in the world, and has been loosing billions in months. But I presume you have a different 'productivity' in mind than just worth. If it's purely numbers of products, someone from the Tata family is probably producing way more cars, rockets and social media platforms. Or else someone in Ali group. Or someone at Aramco, idk. Tesla sells way, way, way fewer (electrical) vehicles than most other large car manufacturers indivually do. If it's relatively to where they started, Musk comes from a (very) wealthy South African family. He certainly increased his wealth incredibly, but I'm certain you'll find a Nigerian, Bangladeshi or even European person who, relatively, increased their wealth much more. Simply by being born with a debt, or nothing, and becoming reasonably rich, will make such a KPI higher.