In: Economics
Real GDP growth 2% per year
Money supply growth 5% per year
Velocity of money is constant.
Use Quantity Theory of Money: MV = PY
Using the chain rule,
% change in (XY) = % change in X + % change in Y
Thus,
%change in M + %change in V = %change in P + %change in
Y
A) Find the Inflation Rate.
Using the above equation,
5% + 0 = %change in P + 2%
%change in P = 3% per annum
Thus, inflation rate is 3% per annum
B) The nominal interest rate is 10%. Find the real interest rate, assuming that inflation will remain the same.
Real interest rate = Nominal interest rate minus Inflation
= 10% - 3%
= 7%
Real interest rate = 7%
C) Suppose you are a small hats retailer. To simplify the analysis, lets assume that the only costs of doing business is paying for the merchandise you are selling. Suppose that you need to pay for the hats in December 2019 and you sell them a year later in December 2020. (Realism is not the point) Suppose that the wholesale price of a hat is $10, you expect to be able to sell a hat for $12 in December 2020 and you need to borrow money to buy the hats. What is the profit per hat? (Hint: The interest you pay on the loan is part of your costs).
Borrow $10 in 2019, at 10% per annum
This loan grows to $11 in 2020
Sell hats for $12 in 2020
Thus, Profit = Total Revenue minus Total Costs
= 12 - 11
= $1 per hat
Profit is $1 per hat
D) Suppose that inflation rose unexpectedly to 10%. suppose that you are able to raise your prices by the additional inflation. The interest rate on your loan remains unchanged. Now what is your profit per hat?
Borrow $10 in 2019, at 10% per annum
This loan grows to $11 in 2020
The selling price per hat rises by 10%, to $13.2 per hat.
Sell hats for $13.2 in 2020
Thus, Profit = Total Revenue minus Total Costs
= 13.2 - 11
= $2.2 per hat
Profit is $2.2 per hat
If all values are converted to 2019 dollars, and inflation effects are removed, the profit per hat under both the scenarios remains the same. This is because inflation raises the prices, but lowers the value of money.
The $13.2 selling price gets deflated by 1.1 (2019 prices), and it is brought back to $12.