 ## Interest rates

When A lends money to B, B repays the amount lent by A (the capital) as well as a supplementary sum known as interest Interest An amount paid in remuneration of an investment or received by a lender. Interest is calculated on the amount of the capital invested or borrowed, the duration of the operation and the rate that has been set. , so that A has an interest in agreeing to this financial operation. The interest is determined by the interest rate, which may be high or low. To take a very simple example: if A borrows 100 million dollars for 10 years at a fixed interest rate of 5%, the first year he will repay a tenth of the capital initially borrowed (10 million dollars) plus 5% of the capital owed, i.e. 5 million dollars, that is a total of 15 million dollars. In the second year, he will again repay 10% of the capital borrowed, but the 5% now only applies to the remaining 90 million dollars still due, i.e. 4.5 million dollars, or a total of 14.5 million dollars. And so on, until the tenth year when he will repay the last 10 million dollars, plus 5% of that remaining 10 million dollars, i.e. 0.5 million dollars, giving a total of 10.5 million dollars. Over 10 years, the total amount repaid will come to 127.5 million dollars. The repayment of the capital is not usually made in equal instalments. In the initial years, the repayment concerns mainly the interest, and the proportion of capital repaid increases over the years. In this case, if repayments are stopped, the capital still due is higher…

The nominal interest rate is the rate at which the loan is contracted. The real interest rate is the nominal rate reduced by the rate of inflation Inflation The cumulated rise of prices as a whole (e.g. a rise in the price of petroleum, eventually leading to a rise in salaries, then to the rise of other prices, etc.). Inflation implies a fall in the value of money since, as time goes by, larger sums are required to purchase particular items. This is the reason why corporate-driven policies seek to keep inflation down. . 