I was reading this question and the accepted answer says that
BigDecimal is the best type for representing currency values. I've also seen several other questions support the use of big decimal.
Why is BigDecimal the best type? I don't understand the relevance of arguments such as precise calculations or people with large net worth. I am pretty sure that there are no currencies that round to the 10th decimal place, and almost no one has 8-bytes worth of money (if it were to store it as a long).
For taxes and other intermediary calculations, I can see how it is important to make sure you are using a proper type that doesn't round/truncate values prematurely, but that doesn't seem relevant to me either since an error of 0.0000000001 cents on the dollar does not seem that big to me.
It may be due to my lack of understanding of the importance of accuracy when it comes to financial statements, so perhaps someone can also clarify whether a millionth of a cent is significant as a final number.