Let's say that they average person makes 3 purchases a day, and let's assume that the average person uses cash for half their purchases ( a high number I think), so 1.5 cash purchases a day (I probably do 1.5 cash purchases a month), and let's assume that for EVERY cash purchase, the total ends with a 3 or an 8, and gets rounded up.
That would mean that the average person would be spending a extra 3 cents a day, which works out to an extra $10.95 per YEAR.
Of course, we assume that the number of round downs is roughly the same as round ups, it is unlikely that anyone will be out by more than about a dollar at the end of the year, and the people out more than that will all be people that make a lot of purchases, meaning that they likely can afford losing $2 a year.
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