An easy and practical way to accomplish this would be to allow people to.pay in actual currency, which from my perspective means 90% silver U.S. coins, which will always have an accepted hard value, regardless of what is happening in other markets.
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Ooh interesting! Hows about an ecoVillage cryptocurrency coin pegged to the price of silver!?
Sounds like a great idea!
My favorite way, though, is simply buying circulated 90% silver US coins, or saving those I find in my change.
Literally the cheapest way to invest in silver, with a ready market all over the world in any economy, zero need for electricity or internet access, and completely usable even in a grid down situation.