But instead of IPOs, Nvidia is the 'ipo,' funding everyone and anyone," Cuban wrote in a post on X (1). Story Continues'The biggest investment bubble in American history'Cuban and Burry are not the only prominent investors sounding the alarm. Over the past five years, as inflation continued to erode the value of paper currency and investors looked for protection outside traditional stocks, gold has climbed 122%. Income, even in a down marketLike stocks, real estate has its cycles, but it doesn't rely on a booming market to generate returns. Owning rental property allows investors to collect monthly rent payments, but being a landlord is rarely as passive as it sounds.