Money is always funny to represent. I did a bunch of research on this for my budgeting app. Turns out that while most countries use two decimal points for their cent/cent equivalent, some use 0, 1, or 3. In addition, at least one country (Sweden I think), doesn't allow values like 0.01. Their smallest denomination is 0.05, and everything is a multiple of it. I ended up storing the data as a decimal type with 3 digits after the decimal, along with the currency. Then I periodically extract the locale data from a Linux timezones package and the app has a giant lookup table for how to represent and parse each currency + value combo. This changes from time to time as currencies get updated and governments change.