Elon Musk lost a significant amount of his net worth on Monday when Tesla shares tumbled around 7.2 per cent, making Jeff Bezos the wealthiest person in the world. Tesla shares fell on Monday after preliminary data showed shipments from its factory in Shanghai slumped to the lowest in more than a year. Amazon stock has doubled since 2022 while Tesla shares have tumbled nearly 50 percent since its 2021 peak.