No. It's not that a gum costs 5 cents because it's the only fraction of a dollar that can be represented in cents, it's because pricing is inherently done in one-cent increments. If there was a need to price single items at a lower-than-a-cent cost, or at prices between one-cent increments, and if the need for that outweighed the disadvantages, there would be a way to do it.
Other example: an apple doesn't cost 1/3 of a dollar, it costs 33 cents. The need for pricing things as a fraction is simply not there. I doubt most people would see 20 cents as '1/5 of a dollar' in the first place.
This might be a difference between people thinking in metric and thinking in imperial, too. (I'm metric, fwiw).
(before someone says 'I buy resistors that cost less than a cent', please show me a place that sells them individually)
Other example: an apple doesn't cost 1/3 of a dollar, it costs 33 cents. The need for pricing things as a fraction is simply not there. I doubt most people would see 20 cents as '1/5 of a dollar' in the first place.
This might be a difference between people thinking in metric and thinking in imperial, too. (I'm metric, fwiw).
(before someone says 'I buy resistors that cost less than a cent', please show me a place that sells them individually)