Comment by revicon
6 hours ago
The statistics on consumers evaluating the purchase of something that is $9.99 vs $10 is well proven.
Switching to round number prices would cost retailers a whole lot more.
https://www.sciencedirect.com/science/article/pii/S002243599...
https://www.researchgate.net/publication/23547242_Penny_Wise...
https://www.sciencedirect.com/science/article/pii/S002243590...
The rounding is applied to an entire-after tax bill, not to shelf prices.
Again: Canada actually did this many years ago. The effect you predict did not appear.