Can a broker lend shares from a cash account? Yes, but only with your explicit permission. It's not uncommon for holders of shares in cash accounts to get a call from their broker asking if they want to lend the shares of a particular stock, and offer an interest payment. That's not the case with a margin account, because the account holder signs away the right to the broker to lend the shares when the account is opened (along with the right to any compensation).
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