Repo is a form of guaranteed loan. A basket of securities serves as an underlying guarantee for the loan. Securities law is transferred from the seller to the buyer and returns to the original owner after the contract is concluded. The most commonly used guarantees in this market are U.S. Treasury bonds. However, government bonds, agency securities, mortgage-backed securities, corporate bonds or even shares can be used in a repurchase transaction. Pension transactions are generally considered safe investments, as the security in question serves as collateral, which is why most agreements involve U.S. Treasury bonds. Considered an instrument of the money market, a pension purchase contract is indeed a short-term loan, guaranteed by security and an interest rate.
The buyer acts as a short-term lender, the seller as a short-term borrower. The securities sold are the guarantees. This will help achieve the objectives of both parties, namely the guarantee of financing and liquidity. A sale/buy-back is the cash sale and pre-line repurchase of a security. These are two separate pure elements of the cash market, one for settlement in advance. The futures price is set against the spot price in order to obtain a market return. The basic motivation of Sell/Buybacks is generally the same as in the case of a conventional repo (i.e. the attempt to take advantage of the lower financing rates generally available for secured loans, unlike unsecured loans). The profitability of the transaction is also similar, with interest on the money borrowed from the sale/purchase being implicitly included in the difference between the sale price and the purchase price. According to Yale economist Gary Gorton, the repo has grown to offer large non-depository financial institutions a method of secured lending, consistent with deposit insurance provided by the government in the traditional banking system, with guarantees being a guarantee for the investor.  There is also a risk that the securities in question will depreciate before the due date, in which case the lender may lose money during the transaction. This time risk is the reason why the shortest buyback transactions have the most favourable returns.