In finance, short selling (also known as shorting or going short) is the practice of selling securities or other financial instruments that are not currently owned, and subsequently repurchasing them ("covering"). In the event of an interim price decline, the short seller will profit, since the cost of (re)purchase will be less than the proceeds which were received upon the initial (short) sale. Conversely, the short position will be closed out at a loss in the event that the price of a shorted instrument should rise prior to repurchase. The potential loss on a short sale is theoretically unlimited in the event of an unlimited rise in the price of the instrument, however, in practice, the short seller will be required to post margin or collateral to cover losses, and any inability to do so on a timely basis would cause its broker or counterparty to liquidate the position. In the securities markets, the seller generally must borrow the securities in order to effect delivery in the short sale. In some cases, the short seller must pay a fee to borrow the securities and must additionally reimburse the lender for cash returns the lender would have received had the securities not been loaned out.