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ECON 103 Chapter Notes - Chapter 4: Real Income, Relative Price, Demand Curve

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scarletcicada217
12 May 2016
School
Simon Fraser University
Department
Economics
Course
ECON 103
Professor
Vasyl Golovetskyy

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Document Summary

Chapter 4 readings: 4. 1 diminishing marginal value (page 58) Diminish marginal value: the maximum one is willing to sacrifice at the margin for a good, per unit of time, declines the more one has of that good other things held constant. Marginal value falls the more you have. Per unit of time means that we"re talking about a rate of consumption and not a total amount: 4. 2 (real) income and (relative) price (page 58) We"re going to make some very simple assumptions about incomes and prices in order to analyze choices individuals make: We"re going to assume that people have fixed incomes, and cannot borrow any money from the bank to enhance that income. We"re going to assume that there are only two goods: 1 ad two: the prices for these goods are known: p1 and p2. These prices are going to constitute the entire cost of goods 1 and 2.

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Related Questions

Determine whether prices increases or price decreaese more salient? (that is, which do we more readily remember)? Why?

The overall CPI is an average, that includes considerable variance. The price of lamb and mutton, for example, is down over 13 percent on the past year. But the price of beef is up 10 percent. The upshot is that most of the rising prices are rising at a rate that's faster than 2 percent. And when you think about inflation, you're probably thinking about the prices that are going up — not the prices that aren't. And you're not wrong to think that most of the goods that are becoming more expensive are becoming more expensive at a faster rate than that. It's just that those price increases are offset by price declines elsewhere.

Another issue is that when firms cut prices, they generally do so a bit on the sly. Sales will be 20 percent off rather than 15 percent off. Or the sale will last two weeks instead of one. Or the markdown will be extended to a larger number of items.

These discounting tactics are designed to maximize revenue from less-thrifty shoppers. But they're also meant to make you feel subjectively like you got a good deal through your own personal thrift and diligence. That same feeling, however, tends to blind you to the reality that if you are finding more great deals lately probably everyone else is too. Prices are falling and you just don't realize it.

Source: http://www.vox.com/2014/7/22/5926079/inflation-perceptions-frequency-bias

1. The Houston Chronicle reported that in Houston, the average price of new homes has decreased, while at the same time, the number of new homes sold has increased. This situation could be explained by which one of the following: (draw curves before answering)

  1. An Increase in demand
  2. An Increase in supply
  3. A Decrease in demand
  4. A Decrease in supply

2. In another market, the average price of new homes fell, while at the same time, the number of new homes sold decreased. The situation would best be explained by (Draw the curves before answering)

  1. An Increase in Demand
  2. An Increase in Supply
  3. A Decrease in demand
  4. A Decrease in supply

3. A consumer is said to have achieved maximum total utility when:

  1. Purchases of Good A give the same satisfaction as purchases of Good B.
  2. Purchases of the last dollar spent on Good A give the same satisfaction as purchases of the last dollar spent on Good B.
  3. The average purchases per dollar of Good A give the same satisfaction as the average purchases per dollar of Good B.
  4. The total utility derived from Good A is the same as the marginal utility derived from Good B.

4. You are given the following information about a firm's present output position: MPP (Marginal Physical Product) of Land = 12; MPP of Labor = 16; Price of Land = $2; Price of Labor = $4. With no additional money to spend, this firm should:

5. A firm achieves the least cost in production by substituting factors until

  1. their factor prices are equal
  2. their marginal products are equal to the factor prices
  3. their marginal products are each equal to zero
  4. the ratios of their marginal product equal the ratio of their prices
  5. none of the above

6.The economy is currently on its production possibilities frontier (PPF). A politician says that it is possible to get more of everything--more infrastructure, more schools, more national defense, more spending on social programs, and so on. The politician is

  1. correct if he is assuming a rightward-shifting PPF.
  2. incorrect if he is assuming a rightward-shifting PPF.
  3. correct if he is assuming a PPF that does not change.
  4. none of the above

7. Assume your swimsuit business is at its maximum profit position, and one new change occurs: consumer incomes decrease. If swimsuits are normal goods, the equilibrium price of swimsuits will __________, and the CONSUMER surplus will ________.

  1. increase, increase
  2. decrease, decrease
  3. increase, decrease
  4. decrease, increase

8. Firms that shuts-down in the short-run still must pay:

  1. Marginal cost
  2. Variable cost
  3. Fixed cost
  4. Total cost

9. The term externalities refer to:

  1. Black-market economic activity.
  2. The impact on markets of imported goods.
  3. The costs and benefits of a market activity borne by a third party.
  4. The inequitable distribution of income.

10. If full external costs are not internalized, firms will tend to allocate more of society's scarce resources to produce than is societally warranted, and if full external benefits are not internalized, firms will allocate less of society's resources to produce than is societally justified. True/False.

11. Joe was very careful about smoking in his home until he bought a fire insurance policy. After buying the policy, he became careless. His attitude is: "I'm insured. What do I care if this place burns down; I'll just collect the money". Joe's attitude is an example of ______________.

12. Megatrust Bank had historically scrutinized loans very carefully and extended them, only to persons whom they considered very creditworthy. They made relatively few loans. However, after the government provided guarantees to sub-prime loans, Megatrust relaxed its standards and increased its loan volume. (And its default rate as well.) This is an example of _______________.

13. In the short-run, if a perfectly competitive firm finds itself operating at a loss, it will

  1. Reduce the size of its plant to lower fixed costs.
  2. Raise the price of its product.
  3. Shut down.
  4. Continue to operate as long as it covers its variable cost.

14. If income today is more equally distributed than it was in 1960, a Lorenz Curve depicting today's distribution would be

  1. More bowed and to the left of the 1960's curve.
  2. More bowed and to the right of the 1960's curve.
  3. Less bowed and to the left of the 1960' curve.
  4. Less bowed and to the right of the 1960's curve.

15. Which of the following statements is true?

  1. As output increases, the average fixed cost becomes smaller and smaller.
  2. Average fixed cost does not change as output increases.
  3. The marginal cost curve intersects the average fixed cost curve at its minimum point.
  4. When marginal cost is greater than average fixed cost, average fixed cost increases.
  5.  

16. A firm in any of the market structures we have studied will maximize its profit (or minimizes its loss) when its

  1. Average costs are at a minimum
  2. Marginal revenue and marginal cost are the same.
  3. Marginal revenue is less than marginal cost.
  4. Marginal revenue is zero.

17. If the demand for a good increase, when the price of other good increases, these goods are

  1. Capital goods
  2. Substitute goods
  3. Complementary goods
  4. Luxury goods

18. Which of the following pairs of products are complementary goods?

  1. mobile phones and laptops
  2. pens and pencils
  3. sugar and artificial sweeteners
  4. radios and television
  5. toothbrushes and toothpaste

19. The amount of a good that is given up to produce another good is:

  1. Scarcity
  2. Specialization
  3. Opportunity cost
  4. Trade
  5. Efficiency

20. The most important characteristic of the equilibrium price is that it:

  1. Guarantees that producers earn a profit.
  2. Increases the quantity demanded.
  3. Clears the market.
  4. Decreases the quantity supplied.

21. Rank the following market structures based on the number of participating firms: From the fewest number of firms to the most number of firms:

  1. Oligopoly
  2. Perfect Competition
  3. Monopoly
  4. Monopolistic Competition

22. If firms in a monopolistically competitive market are earning economic profits which of the following scenarios would best reflect the change facing incumbent firms as the market adjusts to its new equilibrium?

  1. an increase in demand
  2. a decrease in demand
  3. a downward shift in their marginal cost curve
  4. an upward shift in their marginal cost curve


23. If labor in Mexico is less productive than labor in the United States in all areas of production, 

  1. neither nation can benefit from trade
  2. Mexico can benefit from trade but the United States cannot
  3. Mexico will not have a comparative advantage in any good
  4. both nations can benefit from trade

24. Which of the following statements is false?

  1. The typical monopolistically competitive firm could reduce its average total cost if it produced more output.
  2. Monopolistically competitive firms advertise to increase the elasticity of the demand curve they face.
  3. Expensive advertising might help consumers if it is a signal that the product is good.
  4. Brand names acquired at great cost might help consumers by assuring quality.

25. Suppose the state of Wyoming passes a law that increases the tax on cigarettes. As a result, smokers who live in Wyoming start purchasing their cigs in surrounding states. Which of the following principles does this best illustrate:

  1. people respond to incentives
  2. rational people think at the margin
  3. a trademark can make everyone better off
  4. markets are usually a good way to organize economic activity

CLASS NOTES ARE LOCATED WHERE IT SAYS CLASS NOTES!

During the early 1700s, a sailing ship is wrecked on an uninhabited island in the Caribbean Sea. The passengers and crew survive but lose all their possessions. There is no source of fresh water on the island, but coconut palm trees are fairly abundant, and the survivors are able to drink milk harvested from coconuts. There are no mammals living on the island, but many birds roost there, and these become a source of meat. There are a number of mango trees that provide fruit. A long, tough form of sawgrass grows in a number of different places on the island. This grass can be woven into knee-length sleeveless shirts, which are the basic type of clothing for people of both genders. The people on this island have developed a simple system of direct market exchange. Currently, two mangos trade for five coconuts, six coconuts trade for a pound of meat, and three pounds of meat trade for four shirts.

1. Use a formula that was stated in class, and in my notes, to calculate the total number of distinct relative prices in the island’s economy. Note that when this formula is used to count relative prices, any given pair of goods is considered to have only one relative price. For example, if we count the price of a pound of meat in mangos as one relative price, then we don’t count the price of mangos in pounds of meat as a second relative price.

(Class Notes: In a barter economy with markets, each good should have a market price, per unit, in terms of each of the other goods: baskets of fish per bushel of apples, bags of coconuts per bushel of apples, etc. A price of this type – units of one good per unit of the other good – is called a relative price (alternatively, a barter price). If there are different goods traded in an economy, then there turn out to be relative prices for a merchant to keep track of, in each market he visits. Each of the n goods has unit prices: one for each of the other goods. We divide by two to avoid counting reciprocal duplicates: if it costs 2 bags of coconuts to buy a bushel of apples, then it costs 1/2 bushel of apples to buy a bag of coconuts, and so on. )

2. Use the price information you are given to calculate all the distinct relative prices. Remember that the prices we are interested in are unit prices. A unit price is the price of a single unit of one good in units of another good. For each pair of goods, use the order that produces the highest unit price. In the case of coconuts and shirts, for example, if the price of a shirt in coconuts is higher than the price of a coconut in shirts, then report the first price but not the second one. Note: In calculating unit prices, don’t worry about issues of divisibility. Assume that any good can be divided in any way, so that fractions or decimals can be components of unit prices.

3. For each relative price you just calculated, calculate the relative price if the order of the two items is switched. (In the scenario above, for example, you would now calculate the price of a coconut in shirts.) What very simple formula can you use to do this? Explain briefly.

4. Now suppose the people on this island start using mangos as money. The relative prices on the island do not change, and the absolute prices are consistent with them. a. Use a formula stated in class, and in my notes, to calculate the total number of absolute prices in the island’s economy. b. Report these absolute prices.

Class Notes: ( In a monetary economy, in contrast, each good has a single absolute price (alternatively, a money price), which is its unit price in terms of money: dollars per bushel of apples, etc. If we assume that one of the n goods is used as money, then a merchant only needs to keep track of absolute prices. As long as there are more than two different goods ( ), it turns out that , and the difference between these two numbers gets very big as n gets large. Even if there are only 10 different goods, then there are 45 relative prices and only 9 absolute prices. And if there are 100 different goods, which is a more realistic number, then there are 99 absolute prices but almost 5000 relative prices.)

5. Comment briefly on the potential advantages and disadvantages of using mangos as money, using our list of the desirable properties of money as a guide.

6. Suppose you are a merchant on this island, where mangos are used as money in the market (see Item 4 above). A competing merchant who dislikes using money in transactions is willing to trade coconuts for shirts (or vice-versa) directly, at a rate of five coconuts per shirt. Explain, carefully and completely, how you could use this merchant’s willingness to trade these two goods, at this rate, in order to make a profit of one unit of money for yourself by (1) using money to buy units of a good in the market, (2) trading those units of the good to this merchant, in exchange for units of another good, and (3) selling those units in the market for money. Identify the items traded and the quantities, and verify the amount of the profit. Finally, explain what you would need to do in order to make a larger profit (double, for example).