Pay it forward is an expression for describing the beneficiary of a good deed repaying the kindness to others rather than paying it back to the original benefactor. It is also called serial reciprocity.
A "pay it forward" chalkboard in a coffee shop, where patrons pay in advance for drinks to be given to others
In finance, a loan is the transfer of money by one party to another with an agreement to pay it back. The recipient, or borrower, incurs a debt and is usually required to pay interest for the use of the money.
Loan document issued by the Bank of Petrevene, Bulgaria, dated 1936.