No other retailers advertise their prices in fractions of a cent. The pricing practice first appeared in the early 20th century in the US as a sales taxes on gas to help build highways. At the time, taxes were levied in tenths of a cent and gas stations passed them on directly to drivers. The practice continued in the US and Canada when gas companies realized that psychologically, consumers would see the main number and not the tenths when considering prices. That would allow gas stations to get away with charging an extra tenth of a cent.
Here’s why the price of gas always ends in 9/10 of a cent
