What would value be in this equation? What people deem the value? I like the idea that money is a store of value. Not that it itself is value, but that so long

What would value be in this equation? What people deem the value? I like the idea that money is a store of value. Not that it itself is value, but that so long as it is hard enough (can't be reproduced easily) then you can save it to use another day.