Billionaires' wealth has more than doubled over the past decade, surging by 121% to $14 trillion, significantly outpacing the 73% growth of global stock markets. The number of billionaires rose from 1,757 to 2,682, with tech billionaires seeing the fastest wealth increase, driven by the AI boom. In contrast, real estate billionaires have struggled due to rising interest rates and inflation, while many billionaires are looking to diversify their investments in real estate, stocks, gold, and cash.