correct. the latest numbers from the federal reserves estimates the total value of all physical US currency in circulation at about $2.3 trillion. meanwhile, this analysis of data from forbes puts the combined wealth of US billionaires at about $4.2 trillion as of April 2021, and that number has almost certainly risen since then. billionaires don’t run on cash, they run on manipulating numbers in computer systems, and most of their wealth is in the forms of stocks and such, rather than money in a bank account anyways.