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And, once the race to the bottom reaches .0, the petrol station operator that stuck to .9 is back in the lead, again regardless of the significant digits! It would be a bit of a retail version of the Shepard tone: https://en.wikipedia.org/wiki/Shepard_tone

It’s not a race to the bottom because what Asda is doing is pricing it 175.8 when others price it 174.9

I assumed they meant a race to the bottom in terms of decimal digits only. Another petrol station could price it at 175.7, or maybe even 176.7 if the illusion of being cheaper than ASDA still works.

https://m.youtube.com/watch?v=rnso4nfdM9w

Asda in Arbroath was .7 when I went past the other day.