That is perhaps stretching of what is usually meant by a productive assets (you can make the same argument for a piece of art, for example, or really anything).

That is perhaps stretching of what is usually meant by a productive assets (you can make the same argument for a piece of art, for example, or really anything). Typically, the asset itself is productive, not that it can be used in a productive activity (e.g., gold as an non-productive asset even though you can lend it out).