Reference for Bava Metzia 87:9

הנחשת קונה את הכסף והכסף אינו קונה את הנחשת מעות הרעות קונות את היפות והיפות אינן קונות את הרעות

whereas a <i>zuz</i> can be guarded [by itself]; or perhaps, the care given to a purse is not the same as that of a [single] <i>denar</i>?<span class="x" onmousemove="('comment',' He knows that he will give greater care to a whole purse than to one coin, and therefore here too he may be regarded as having actually taken the coin and replaced it, so that it should be better kept, in which case the whole purse is made subservient to the denar. ');">⁹</span>

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