IS MP Model Flashcards
Real Interest Rate
A real interest rate is an interest rate that has been adjusted to remove the effects of inflation. Once adjusted, it reflects the real cost of funds to a borrower and the real yield to a lender or to an investor.
The real interest rate is determined by r= Marginal Product of capital
Real and Nominal Interest Rates
Interest: Additional payout that one obtains from investment
Two alternative concepts: Nominal Interest and Real Interest
R: Real Interest Rate, the “real” return on an investment, how many extra apples can we buy from a given investment?
i: Nominal Interest Rate, the “nominal” return on an investment
…. how much extra dollars do we get from an investment
Linking nominal and real interest rates: R=i-inflation
Real interest rate = nominal interest rate – inflation
Interest Rates: Measure of Opportunity Costs
Historical example: Durable and shoddy T-shirts in US and UK
- UK manufacturers typically made products designed to last.
- US manufacturers made shoddy products that fail.
Are US manufacturers bad at what they do?
Suppose:
Good t-shirts last 2 years cost $15 upfront
Bad t-shirts last 1 year, cost $10
What is the total cost of owning a t-shirt over 2 years, assuming no inflation?
How do interest rates come into play into determining consumer preferences?
The Fisher Equation
Describes the relationship between nominal and real interest rates under the effect of inflation.
Nominal Interest Rates
The rate that is advertised by banks, debt issuers, and investment firms for loans and various investments.
Nominal Interest Rate = Real Interest Rate + Projected Rate of Inflation.
Key Takeaways: Interest Rate
Interest rates represent the cost of borrowing or the return on saving, expressed as a percentage of the total amount of a loan or investment.
A nominal interest rate refers to the total of the real interest rate plus a projected rate of inflation.
A real interest rate provides the actual return on a loan (to the lender) and on a bond (to the investor).
To calculate the real interest rate, subtract the actual or expected rate of inflation from the nominal interest rate.
Nominal interest rates can indicate current market and economic conditions while real interest rates represent the purchasing power of investors.
Potential vs Current Output
Short-Run Model
The economy is constantly being hit by unforecastable “shocks”
Monetary policy affect the real economy in the short run:
1. Contrast with quantity theory of money
2. Contrast with fiscal theory of money
There is a dynamic tradeoff between output and inflation:
Elevated output above potential => high inflation
ISMP Model
A macroeconomic tool which displays short-run fluctuations in the interest rate, inflation and output.
IS Curve
IS Curve
IS Curve: The Consumption Model
IS Curve: The Investment Model
Goods Market Equilibrium
Goods Market Equilibrium: R & Y