It would take a bit more time, because stock certificates are a pain to handle. But I would let you borrow my stock certificates (for interest and with good collateral), you would sell them to someone; then that person might let you borrow them (for interest and with good collateral) and you could sell them to another someone (or the same someone, whatever).

Certificated stock is slightly less fungible than shares of book-entry stock; because I probably want you to return a single certificate with my shares, and you may have to separate or combine certificates which takes time and money. One of the many reasons certificated stock has been on the way out.