The worth of monetary transactions is also difficult to measure. While a price, wage, or other kind of transaction can be recorded at a precise point in time, the worth of the amount must be interpreted.
Links to U. S. government documents listing retail prices for typical consumer purchases, and wages for common occupations. All data is for the United States unless specifically indicated. Linked to the Library Guide created by Marie Concannon at the University of Missouri Libraries.
The project records every published type of Roman Imperial Coinage from Augustus in 31 BC, until the death of Zeno in AD 491. This is an easy to use digital corpus, with downloadable catalog entries, incorporating over 43,000 types of coins.
A list of museums with collections about money or monetary systems. Not all have useful web sites in English. Also worth reviewing is the Wikipedia History of Money page: https://en.wikipedia.org/wiki/History_of_money