Pricing in "Bitcoin days destroyed" Is it possible to use "Bitcoin days destroyed" as unit of currency? If yes, how to price anything using this? If no, why not?
In other words, a system where coins that have not been spent recently are worth more? I suppose you could do such a thing, but it doesn't seem useful; typically friction in economies is a bad thing. 

But I imagine you'd price things just like in any other market: supply and demand.