<prompt> Human: This question isnt out of immediate practicality but more curiosity. I was wondering what you would do with your liquid cash if you have an extremely large amount lets say 100M. You wouldnt want to exceed 250K in any given account theoretically because you are risking it but it seems impossible to manage hundreds of accounts or more, I have read that its possible for multiple accounts to be bundled and treated as one but have multiple FDIC limits but someone in another thread said this is incorrect and it includes all your products at a financial institution.I was wondering if anyone who is fortunate enough to either be ultra wealthy, or manage someones finances who is ultra wealthy would be kind enough to chip in to explain what is done to mitigate downside risk with cash allocation.thanks!  <response>: US Treasuries are basically backed by the same guarantee as FDIC - the full faith and credit of the United StatesPeople who need to safely park large amount of cash usually buy US Treasuries - it is considered the safest financial instrument in the world in terms of default risk, and you can practically eliminate interest rate risk by buying only short term T-Bills.The treasury market is also extremely liquid, so you can easily buy a billion worth of T-Bills in one shot if you need to.During the financial crisis in 2008 the demand for T-Bills was so strong that the nominal yields actually briefly went negative. This means people were willing to pay more than 1 to store 1 worth in Treasuries - instead of getting interest, they were paying interest to the US Treasury to hold their money. This was during the time when nobody knew which of the largest banks could fail next, so the confidence in the banking system was at an all time low and the FDIC limit was only 100k back then 