interest rate
Economics
The percentage of an amount of money charged for its use per some period of time (often a year).
Finance
Examples of interest rate in the following topics:

The Interest Rate Risk
 Interest rates became volatile during the 1980s, forcing banks to become more concerned with interestrate risk.
 If the interestrate sensitive liabilities exceed the interestrate sensitive assets, then rising interest rates cause banks' profits to plummet, while falling interest rates cause banks' profits to increase.
 If the interestrate sensitive liabilities are less than interestrate sensitive assets, subsequently, increasing interest rates cause banks' profits to soar, while declining interest rates cause banks' profits to plummet.
 If the interestrate sensitive liabilities equal the interestrate sensitive assets, then fluctuating interest rates do not affect bank profits.
 If the interest rate rises, subsequently, the banks increase the interest rate on the loans.

The Equilibrium Interest Rate
 The interest rate is the rate at which interest is paid by a borrower (debtor) for the use of money that they borrow from a lender (creditor).
 Interest rates fluctuate over time in the shortrun and longrun .
 Changes in expectations will therefore affect the equilibrium interest rate.
 Interest rates fluctuate over time as the result of numerous factors.
 Interest rates fluctuate based on certain economic factors.

Interest Rates and Economic Rationale
 The interest rate is one of the primary influences on economic rationale.
 The interest rate is the rate at which interest is paid by a borrower (debtor) for the use of money borrowed from a lender (creditor).
 Interest rates also influence inflationary expectations.
 When the interest rate is lower, it usually increases the broad supply of money.
 The interest rates reached 14% in 1969 and lowered to 2% by 2003.

Macroeconomic Factors Influencing the Interest Rate
 Taylor explained the rule of determining interest rates using three variables: inflation rate, GDP growth, and the real interest rate.
 An interest rate is the rate at which interest is paid by a borrower for the use of money that they borrow from a lender in the market.
 The interest rates are influenced by macroeconomic factors.
 In other words, (πt  π*t)is inflation expectations that influence interest rates.
 Taylor explained the rule in simple terms using three variables: inflation rate, GDP growth, and the equilibrium real interest rate.

Comparing Interest Rates
 It provides an annual interest rate that accounts for compounded interest during the year.
 The Fisher Equation is a simple way of determining the real interest rate, or the interest rate accrued after accounting for inflation.
 To find the real interest rate, simply subtract the expected inflation rate from the nominal interest rate.
 The nominal interest rate is approximately the sum of the real interest rate and inflation.
 Discuss the differences between effective interest rates, real interest rates, and cost of capital

The Fisher Effect
 We only discussed nominal interest rates.
 We did not adjust the nominal interest rates for inflation.
 Investors and savers are concerned about the real interest rate because the real interest rate reflects the true cost of borrowing.
 It equals a geometric average of the expected inflation rate and real interest rate.
 We calculated the real interest rate in Equation 3.

Interest Rate Levels
 An interest rate is the rate at which interest is paid by a borrower for the use of money that they borrow from a lender.
 An interest rate is the rate at which interest is paid by a borrower for the use of money that they borrow from a lender.
 Changes in interest rate levels signal the status of the economy.
 If interest rates are unchanged, an increase in the level of aggregate demand will follow.
 Because there is an excessive demand for real balances, the interest rate rises.

Price Risk
 Interest rates and bond prices carry an inverse relationship.
 Bond price risk is closely related to fluctuations in interest rates.
 Fixedrate bonds are subject to interest rate risk, meaning that their market prices will decrease in value when the generally prevailing interest rates rise.
 When the market interest rate rises, the market price of bonds will fall, reflecting investors' ability to get a higher interest rate on their money elsewhere — perhaps by purchasing a newlyissued bond that already features the new higher interest rate.
 On the flip side, if the prevailing interest rate were on the decline, investors would naturally buy bonds that pay lower rates of interest.

Differences Between Real and Nominal Rates
 In the case of a loan, it is this real interest that the lender receives as income.
 If the lender is receiving 8% from a loan and inflation is 8%, then the real rate of interest is zero, because nominal interest and inflation are equal.
 Where r is the real rate, i is the inflation rate, and R is the nominal rate.
 The real rate can be described more formally by the Fisher equation, which states that the real interest rate is approximately the nominal interest rate minus the inflation rate: 1 + i = (1+r) (1+E(r)), where i = nominal interest rate; r = real interest rate; E(r) = expected inflation rate.
 The relationship between real and nominal interest rates is captured by the formula.

Calculating Present Value
 Calculating the present value (PV) is a matter of plugging FV, the interest rate, and the number of periods into an equation.
 Finding the present value (PV) of an amount of money is finding the amount of money today that is worth the same as an amount of money in the future, given a certain interest rate.
 Interest Rate (Discount Rate): Represented as either i or r.
 One area where there is often a mistake is in defining the number of periods and the interest rate.
 The problem may talk about finding the PV 24 months before the FV, but the number of periods must be in years since the interest rate is listed per year.