The ease with which a good can be sold on the market whenever its holder desires, with the least loss in its price [^1]
Salability across scale:
Can be conveniently divided into smaller units or grouped into larger
Salability across space
Can be transported or carried easily. High value per unit of weight
Salability across time
Most critical - its ability to hold value, allowing the holder to store wealth in it.
Acceptability by others
The more people accept it, the more liquid it is. in peer-to-peer situations, a small number of winning protocols tend to emerge.