Macroeconomics
Macroeconomics
5th Edition
ISBN: 9781319098759
Author: Paul Krugman, Robin Wells
Publisher: Worth Publishers
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Chapter 12, Problem 16P
To determine

Concept Introduction:

Aggregate Demand Curve ( AD ): It shows how price and the quantity demanded are related to each other. The curve is negatively slopped which means that when prices rise the quantity demanded falls.

Shift in Aggregate Demand Curve: There are several factors on which the shifting of demand curve depends. Some of them are:

  • Changes in expectation: when consumers are more confident about future then AD curve shifts in the right direction and vice versa.
  • Changes in wealth: when the wealth of individual increases means real value of assets increases then the AD curve shifts in right direction and when it decreases then it shifts leftward.
  • Size of stock of physical capital: when the size of stock is small then AD curve shifts rightward and vice versa.
  • Fiscal policy: It includes government expenditure and taxes. When government expenditure is increased or taxes are decreased then Ad curve shifts rightward and vice versa.
  • Monetary policy: It includes money supply changes. When money supply increases Ad curve shifts rightward and vice versa.

Appreciation: It is defined as the increase in the value of currencies. It leads to increase in import of goods and services. Consider value of $1 is equal to INR 60. If value of $ increases to INR 70 then dollar has appreciated

Aggregate Supply Curve ( AS ): It shows how price and the quantity supplied are related to each other. The curve is positively slopped which means that when prices rise, the quantity supplied also rises. The curve depends on the duration of time.

Short Run Aggregate Supply ( SRAS ): It is a positively slopped curve in which supply increases when price rises. The reason for upward slopping is that the wages are sticky in short run due to formal or informal contracts. At higher aggregate prices there is higher profit leading to high level of output.

Shift in Aggregate Supply Curve: There are several factors on which the shifting of demand curve depends. Some of them are:

  • Changes in nominal wages: When the nominal wage increases then the SRAS curve shifts leftward and vice versa.
  • Changes in productivity: When productivity increases due to introduction of new technology or innovation then the SRAS curve shifts rightward and vice versa.
  • Changes in commodity price: Consider the oil price to increase then in such case SRAS curve shifts leftward.

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Students have asked these similar questions
1. A firm has the following demand function: P = 60 – 0.5Q    and its total cost is defined by TC= 13+ Qa. Find the maximum revenue b. Find the production to optimize the profit. c. Verify if the marginal revenue and marginal cost are the same at the profit-maximizing productionlevel. Exercise 6From the point of view of the firm, what decision criteria have been found relevant in the analysis ofproduction and profit? Provide two refernces with your answer.
5. Some people find options expensive and use more complex structures to reduce the cost. For example, consider buying a call with a strike of $55 and selling a call with a strike of $60. a. What is the cost of establishing this combined position? b. What is the payoff of the combined position if the market price goes to $60? c. What is the payoff of the combined position if the market price goes to $100?
3. An investor has $1,000 to invest. They believe the price of the underlier will increase to $60 within one year. a. How many shares of stock could they buy with the $1,000 at the current price of $50, and how much would they make if the share price increased to $60? b. How many calls with a strike of $55 could they buy for the same $1,000, and how much would they make if the share price increased to $60? c. How much would they make (or lose) from the stock and from the calls if the share price declined to $40? 4. What is the premium on a call with a strike of $0.01? Why is the premium so close to the $50 share price?
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