:xenia_blahaj: 
SciFi though:
I wonder how realistic it would be for a space based culture, mostly STL, to peg their commodity currency to a liter of water. With the value mostly depending on the cost of extraction and purification.
Since water is so useful in space.
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I am reminded of Radford's work on cigarette currencies, which included noting the disadvantage that actually smoking the cigarettes had a deflationary effect on said currency.
I'm not sure making drinking (and other life-support related activities) deflationary would be good for the water economy.
(Assuming high costs of extraction and purification, of course. If anyone can drag in an iceteroid in their off-hours, it'll have more the Adamsian leaf problem.)
