My reasoning is that the period is a "stronger" punctuation mark than the comma, and it should be used for the more important separation.
https://en.wikipedia.org/wiki/Decimal_separator
My reasoning is that the period is a "stronger" punctuation mark than the comma, and it should be used for the more important separation.
https://en.wikipedia.org/wiki/Decimal_separator
Either way it can easily be turned into 1,001.00 or 1.001,00. That's why there's a written out form of the number.