2174: Why Merchants Prefered Roman Numerals Nov 27, 2020

While Arabic numerals eventually won out (or one out, some might say), for most of European history Roman numerals were used. Part of the reason that a few centuries ago Roman numerals were prefered was that the most common need for writing them was not with mathematics per se but with commerce. Merchants prefered to use Roman numerals because they are not so easy to counterfeit because they fall into a particular order, whereas in Arabic numerals someone could just add more digits. Moreover there were actual anti-counterfeit measures built in, such as how the terminal I (representing 1) would be written as a J for instance: XXIIJ (23) so that no one could just add extra digits.