1. Interest is the use fee of money in a certain period of time, which refers to the reward that the money holder (creditor) gets from the borrower (debtor) for lending money or monetary capital. Including deposit interest, loan interest and interest generated by various bonds. Under the capitalist system, the source of interest is the surplus value created by hired workers. The essence of interest is a special transformation form of surplus value and a part of profit. Interest is the reward that the fund owner gets for lending the fund, which comes from a part of the profits that the producer makes by using the fund to play its operational functions. Refers to the value-added amount brought by monetary funds injected and returned to the real economy. The calculation formula is: interest = principal × interest rate × deposit period × 100%.
Second, the abstract interest point refers to the value-added amount brought by monetary funds injected into the real economy and returned. In a less abstract sense, interest generally refers to the remuneration paid by the borrower (debtor) to the lender (creditor) for using the borrowed currency or capital. Also known as the symmetry of sub-fund and parent fund (principal). The calculation formula of interest is: interest = principal × interest rate × deposit period (i.e. time).