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ECON-221 Lecture 2: Econ 221 - Lecture 2

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coppermule660
6 Aug 2020
School
Diablo Valley College
Department
Economics
Course
ECON-221
Professor
yoon

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Document Summary

Key assumptions of the supply & demand model. Four basic assumptions that underlie the development of the supply & demand model. In many cases they are unrealistic and few satisfy all of them but that is the strength of the model as when some of the assumptions fail it still provides a good description of how markets work. All goods in the market of homogenous; consumer is happy with any. Commodities = products traded in markets in which consumers view different varieties of the good as essentially interchangeable. Commodities = wheat, soybeans, crude oil, gold. Extension of the identical goods assumption but adds: No special deals for specific buyers or quantity discounts. Everyone knows what everyone else is paying. We assume everyone knows all the prices and just reacts to them: there are many buyers and sellers in the market occurs in the market or on price level esp.

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Related Questions

1. What happens when we reverse the information assumptions in the Akerlof model? Let us assume that buyers have perfect information about car quality, and that sellers have no information about the quality of any specific car (although they do know the distribution of car quality). Assume that all other basic assumptions apply as usual, including the buyer and seller utility functions.

(a) Explain how these information assumptions might be possible in certain circumstances. What sorts of goods would likely have markets that feature these counterintuitive assumptions?

(b) Imagine that you are a car seller who owns car i with quality Xi (un- known to you). What strategy could you pursue to sell the car in such a way that your utility increases?

(c) Does adverse selection occur in this market?

Q 1: Below is a production possibilities table for consumer goods and capital goods : Production Alternatives Capital Goods Consumer Goods A 0 70 B 3 65 C 6 55 D 9 40 E 12 20 F 15 0 a. Show these data graphically. Upon what specific assumptions is this production possibilities curve based? b. If the economy is at point C, what is the cost of one more unit of capital good? Of one more unit of consumer good? Explain how the production possibilities curve reflects the law of increasing opportunity costs. c. If the economy characterized by this production possibilities table and curve were producing 7 units of capital goods and 45 units of consumer goods, what could you conclude about its use of its available resources? d. What would production at a point outside the production possibilities curve indicate? What must occur before the economy can attain such a level of production? e. Assume consumer good are bread and cookies here. What happens to this frontier if disease kills half of the economy’s hens and cows? Q 2(a): How does self-interest help achieve society’s economic goals? Why is there such a wide variety of desired goods and services in a market system? In what way are entrepreneurs and businesses at the helm of the economy but commanded by consumers? b. Why is private property, and the protection of property rights, so critical to the success of the market system? c. How the market system decides what to produce, how to produce it, and who obtains it. Q 3: How will each of the following changes in demand and/or supply affect equilibrium price and equilibrium quantity in a competitive market; that is, do price and quantity rise, fall, or remain unchanged, or are the answers indeterminate because they depend on the magnitudes of the shifts? Use supply and demand diagrams to verify your answers. i. Supply decreases and demand is constant. ii. Demand increases and supply increases. iii. Supply increases and demand decreases. b. Explain why the price in competitive markets settles down at the equilibrium intersection of supply and demand. Explain what happens if the market price starts out too high or too low. c. Consider the following events: Scientists reveal that consumption of oranges decreases the risk of Corona Virus and, at the same time, farmers use a new fertilizer that makes orange trees more productive. Illustrate and explain what effect these changes have on the equilibrium price and quantity of oranges.

1.
Which of the following is not a characteristic of a market?

A. Markets are physical locations where trading occurs
B. Voluntary exchanges between economic agents
C. Flexible prices
D. There are rules and arrangements for trading


2.
How would a decrease in supply affect the equilibrium price in a market?

A. The equilibrium price would remain the same
B. The equilibrium price decreases.
C. The equilibrium price increases.
D. More information is needed. It may increase, decrease, or remain the same.

How would the equilibrium price in a market be affected if there were a large increase in supply and a small increase in demand?

A. The equilibrium price would remain the same
B. The equilibrium price decreases.
C. The equilibrium price increases.
D. More information is needed. It may increase, decrease, or remain the same.

How would the equilibrium price in a market be affected if there were a large decrease in supply and a small decrease in demand?
A. The equilibrium price would remain the same
B. The equilibrium price decreases.
C. The equilibrium price increases.
D. More information is needed. It may increase, decrease, or remain the same.

4.
What does it mean to say that we are running out of "cheap oil"?
A. That there are declining reserves of low-quality oil, but there is still plenty of high-quality oil remaining.
B. That world demand for oil is declining , which will raise the price of oil in the future.
C. That we will soon seplete all the world's oil reserves, which will cause the price of oil to increase significantly.
D. That oil reserves are becoming more expensive to find and extract over time.

What doese this imply for the price of oil in the future?
A. the demand for oil will increase, which will lead to lower prices in the future.
B. the demand for oil will decrease, which will lead to higher prices in the future.
C. The supply of oil will increase, which will lead to lower prices in the future.
D. The supply of oil will decrease, which will lead to higher prices in the future.


5.
What is meant by holding all else equal and how is this concept used when discussing movements along the demand curve?
A. everything else in the economy is held constant, including the price of the good.
B. All variables that can affect the demand for the good are held constant.
C. All variables in the model are set to equal values.
D. All of the above.

We make the assumption of holding all else equal when considering demand curves since we want to focus on the changes in the quantity demanded that result from changes in [ only the price of a good / only the income of consumers / the price of a good and incomes ]