Final answer:
Money is considered fiction because its value is a consensual social construct rather than having inherent tangible worth; this is particularly evident during a financial crisis when value can vanish quickly due to the loss of confidence in financial instruments rather than physical currency.
Step-by-step explanation:
When Jacob Goldstein's aunt says that "money is fiction," she means that money is not inherently valuable or tangible in the way physical objects are; its worth is something we agree upon as a society. Most modern money is simply a series of electronic records that reflect transactions and value. Bank robber Willie Sutton was both right and wrong about where money is; while he was correct in seeing banks as essential in the economy's flow of money, he was incorrect in assuming it exists primarily in physical form. In a modern economy, money is tied up in complex financial instruments, and during a financial crisis, when assets devalue rapidly, the 'lost' money is largely a loss of perceived value, rather than physical cash disappearing.