What is the problem you're trying to solve?
The problem in reading a lot of historical and economic material (both on-line and on paper) is that the reader often has no sense of the inflationary effect on a national currency, or of the conversion rate between currencies. Therefore the value of the information is lost. When told an author earned $35,000 from a book in 1977, many readers would not be able to judge whether this was exceptionally large, or just normal for an interesting book. In fact it is exceptionally large.
When someone writes that the author earned 50,000 yen in 1977, I just have no idea whether this amount would have bought a large hotel, or a small car.
It gets worse in real historical articles. Henry VII paid 35 shillings for a horse. Was this enormously expensive? or was it trivial for the wealthy?
What is your solution?
Given basic information (updated for each currency, say once or twice a year) the Wiki computers can make these conversions very easily. The programming is very simple. All it needs is some database from which to extract the conversion factors. Such tables exist already in all economies for dealing with the last century.
It gets more difficult in taking the same idea back a century or two, however. Money-value probably then needs to be spelled out in terms of the weekly average wage of (say) an engine driver, or a labourer. It may need referal to a table where a few different salaries, prices, etc. can be displayed for the year and the country.
Historical comparison material will be easier to understand -- especially for younger readers who haven't lived in days when a good weekly wage was $25. I bought my first house in one of Sydney's inner suburbs for $8,200 on this wage.
[Note how difficult it is to work out how this compares with today's economy.
It is a bit over 6 years full salary because the house had a demolition order on it.]
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