Is there a convention for indicating the year of a monetary amount?
Because of inflation citing a monetary sum is rather useless without specifying the year: $20 in 1900 is very different than $20 in 2000.
Is there a standard way to indicate years?
I would expect one of the following, but I haven't found anything to back one up
- $20 (2000) but this could be confusing in disciplines that use years when citing sources.
- 2000$20 or 20 2000$ after currency conventions like US$, but these could easily confuse the reader into thinking 2000 is a sum, not a year.
- $20 (in 2000 dollars) is perhaps more clear, but is a bit redundant with the two mentions of dollar, and still isn't that clear because it could be interpreted as some kind of fraction ($20 per $2000).
This may be especially useful for charts when indicating axis units.