Interest rates and inflation are closely intertwined in finance. Nominal rates include both the and an , while the explains their relationship. Understanding this connection is crucial for making informed financial decisions.
Real interest rates, calculated using expected or actual inflation, measure the true cost of borrowing. Positive real rates benefit lenders, while negative rates favor borrowers. This concept helps investors and borrowers assess the actual value of their investments and loans over time.
Interest Rates and Inflation
Nominal rates and inflation connection
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consist of two components:
represents the true cost of borrowing determined by supply and demand for loanable funds in the market
Inflation premium compensates lenders for expected loss of purchasing power due to inflation increases as expected inflation rises
states nominal interest rate = Real interest rate + Expected inflation rate
i=r+πe, where i is nominal interest rate, r is real interest rate, and πe is expected inflation rate
When expected inflation increases, nominal interest rates tend to rise to compensate lenders for loss of purchasing power (higher inflation premium)
When expected inflation decreases, nominal interest rates tend to fall as inflation premium decreases (lower inflation expectations)
Calculation of real interest rates
Real interest rate measures true cost of borrowing after adjusting for inflation
calculated using expected inflation
r=i−πe, where r is real interest rate, i is nominal interest rate, and πe is expected inflation rate
calculated using actual inflation
r=i−π, where r is real interest rate, i is nominal interest rate, and π is actual inflation rate
Positive real interest rates indicate nominal interest rate is higher than inflation rate (lenders gain purchasing power)
Negative real interest rates indicate inflation rate is higher than nominal interest rate resulting in loss of purchasing power for lenders (borrowers benefit)
Risk and Interest Rates
Risk impact on interest rates
is risk that borrower will not repay loan
Higher leads to higher interest rates to compensate lenders for increased risk (subprime mortgages)
Credit ratings assess creditworthiness of borrowers and help determine interest rates (AAA, AA, A, BBB, etc.)
is risk that investor may not be able to sell security quickly at fair price
Less liquid securities tend to have higher interest rates to compensate investors for lack of liquidity (corporate bonds vs government bonds)
is risk associated with length of time until bond matures
Longer-term bonds typically have higher interest rates than shorter-term bonds
Investors demand higher return for locking up funds for longer period (10-year Treasury vs 2-year Treasury)
Longer-term bonds are more sensitive to changes in interest rates ()
is risk of changes in interest rates due to economic conditions and market sentiment
When market interest rates rise, value of existing fixed-rate securities falls (bond prices move inversely with yields)
When market interest rates fall, value of existing fixed-rate securities rises (refinancing opportunities)
Time Value of Money and Interest Rates
concept states that money available now is worth more than the same amount in the future due to its potential earning capacity
Interest rates reflect the of using money for one purpose instead of another
shows the relationship between interest rates and time to maturity for bonds of similar credit quality