Isn't that stretching "social"? The money I hold is not tied to the yet unknown individual or group with with whom I will exchange it for goods or services, the person might not even be born yet.
The money one holds always has ties to the people surrounding its owner, no matter if those people are known, unknown, born or unborn (I honestly didn't understand the thing about the unborn people, as we as a society do lots of societal stuff for the people not yet born), and in that regards money is indeed one of the most social/societal things ever. As a matter of fact sociology itself as a science was partly born as a result of Georg Simmel's book called "The Philosophy of Money" [1], published more than 100 years ago.
> Probably considered Simmel's greatest work, Simmel saw money as a structuring agent that helps us understand the totality of life.
Well try to imagine there are no people around in 5 years, only you. Or that your country becomes North Korea. Or that the "yet unborn" generation, for some mysterious reason, completely rejects money. What good is your money.
