A sell/buyback is the spot sale and a forward repurchase of a security. It is two distinct outright cash market trades, one for forward settlement. The forward price is set relative to the spot price to yield a market rate of return. The basic motivation of sell/buybacks is generally the same as for a classic repo (i.e., attempting to benefit from the lower financing rates generally available for collateralized as opposed to non-secured borrowing). The economics of the transaction are also similar, with the interest on the cash borrowed through the sell/buyback being implicit in the difference between the sale price and the purchase price.