In fairy tales, humans can possess exterior souls, things magically containing or embodying individual life force--stone, egg, ring, bird or animal, etc. If the thing is destroyed, the human dies. But while the thing persists, the human enjoys a kind of immortality or at least invulnerability.
Money could be seen as such an exteriorized soul. Humans created it, in some sense, in order to hide their souls in things that could be locked away (in tower or cave) and hidden so their bodies would acquire magical invulnerability--wealth, health, the victoriousness of enjoyment, power over enemies--even over fate.
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