You are technically correct, financial dudes like roman numerals but somewhere in history someone (probably someone reeeeeally powerful) started using MM for million and thus started the trend.
Aside, swiss watches tend to have a watch maker's four on them instead of the more correct IV... and apparently there are a bunch of other variations out there[1]. Though MM is still quite stupid.
Aside, swiss watches tend to have a watch maker's four on them instead of the more correct IV... and apparently there are a bunch of other variations out there[1]. Though MM is still quite stupid.
1. https://en.wikipedia.org/wiki/Roman_numerals#Variant_forms