Mirrorrorrim
Hero
In my campaign, the weight of every coin being 1/50th of a pound is taken seriously by the bankers/moneylenders. Heavier metals are smaller coins. In fact, "coin" can be considered a unit of measurement, which is 1/50th of a pound.I was just thinking about DnD coinage again after seeing this post and it reminded me of the forgotten middle child of dnd currency, the electrum piece. I had to look it up to find out how much it was worth because it made me think that I'd been doing conversion incorrectly but it's just a dnd version of the 50 cent piece.
1cp = $1 (a 1lb. copper trade bar = $50)
1sp = $10 (a 1lb. silver trade bar = $500)
1ep = $50 (a 1lb. electrum trade bar = $2,500)
1gp = $100 (a 1lb. gold trade bar = $5,000)
1pp = $1,000 (a 1lb. platinum trade bar = $50,000)
Once that value and weight is determined to be the baseline, alternative currencies with different weights can be used. If a nation mints a gold coin that is twice has heavy, it is worth twice as much (2gp).
(Edit: You made me think of how electrum fit into my campaign and math, so this started as an electrum response that grew to something more detailed.)
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