…we (me and my family members) think in terms of fractions when dealing with large numbers and differences when the numbers are small.
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Hence why I keep one of these in my selling satchel:
I’d think the opportunity cost is easier to realise with the absolute difference in currency units. The price of any alternatives you might consider is usually specified in currency units.
The only relative that I’d think might be helpful for expensive purchases would be to convert a price orrice difference into number of days/ week / months of your expected disposable income or something like that.
How would that work? Like these ten apples are equal to 2 bags of oranges?
