Why is 37 cents too large for the granularity of a currency? In 1913 terms, 37 cents of today's money was the equivalent of 2 cents, only double their smallest

Why is 37 cents too large for the granularity of a currency? In 1913 terms, 37 cents of today's money was the equivalent of 2 cents, only double their smallest coinage. Would you really be upset if any particular transaction was rounded up or down by 18 cents? Yes, if you're buying a single gumball, the price might be a little high today. But you let me know when gumball machines start taking bitcoins. For anything else, a resolution of +-18 cents is perfectly acceptable.... over any reasonable number of transactions, the round ups and round downs will come out to the same value anyway.