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ECON-200 Lecture Notes - Lecture 5: Demand Curve, Standard-Definition Television, Midpoint Method

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School
Diablo Valley College
Department
Economics
Course
ECON-200
Professor
Sorce

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Document Summary

A change in qs refers to movement along a fixed s curve when p changes. Two types of change in qs: an increase ( ) in qs refers to downward movement along a fixed s curve as p. A decrease ( ) in qs refers to downward movement along a fixed s curve as p. A change in supply refers to a shift in the s curve which occurs when a non-price determinant of supply changes (like input costs or # of sellers). Two types of change in supply: an increase ( ) in supply occurs when the s curve shifts to the right. A decrease ( ) in supply when the s curve shifts to the left. To determine the effects of any event: decide whether event shifts s curve, d curve, or both, decide in which direction curve shifts, use supply-demand diagram to see how the shift changes equilibrium p and q.

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Related Questions

Please review the following work and correct me if I have mixed up the concepts of movements and shifts of supply and demand curves. Feel free to copy and edit/correct my mistakes. I'll be waiting. Thanks in advance!!

Changes in price dictate movements along demand curves. When a decrease in demand or the quality demanded occurs it's a safe bet that it's correlated to a price increase, which in turn leads to a resultant surplus of that particular commodity in the marketplace.  This is because decreased demand means less of that commodity being sold. On the other hand, a price decrease usually leads to an increase in the demand for a particular commodity, or an increase in sales, which in turn leads to a shortage of that commodity in the marketplace.

To shift the demand curve itself, changes need to occur in other aspects of the market beyond simply a change in the price of a commodity. For example, an increase in income means the consumers have more disposable income. With more disposable income, demand for commodities will increase, and results in a shift of the demand curve itself. In this example, the demand curve would shift right. On the opposite side of the coin, cost increases due to production or losses in efficiency may decrease the side of supply, shifting the demand curve to the left.

Analogous to shifts in the demand curve, shifts along a supply curve occur when prices change as well. When the cost to produce a commodity increases, supply drops, and the supply curve shifts to the left. If the cost of production drops, and supply increases, the supply curve shifts to the right as demand develops.

Pharmaceutical supply and demand is an easy way to understand these concepts.

Drug demand increases: Price decreases, supplies decrease.

Drug demand decreases: Price increases, supplies increase.

Drug supply increases: Production costs drop, demand drops.

Drug supply decreases: Production costs increase, demand increases.

"But where and how do movements and shifts occur in the above?"

The primary difference between a change in supply and a change in the quantity supplied is:
Choose one answer.
a. a change in quantity supplied is a shift in the supply curve, and a change in supply is a movement along the supply curve.
b. both a change in quantity supplied and a change in supply are movements along the supply curve, only in different directions.
c. a change in quantity supplied is a movement along the supply curve, and a change in supply is a shift of the supply curve.
d. a change in supply is a movement to the left along the supply curve and a change in quantity supplied is a movement to the right along the supply curve.

Question 2
What is the difference between a shortage and scarcity?
Choose one answer.
a. Scarcity will always exist because choices must be made, but a shortage will only exist if the price is kept below the equilibrium level.
b. Scarcity is a result of two or more alternative uses and will always exist, and quantities of supply and demand adjusting to flexible prices will create shortages.
c. A surplus will exist when a good is scarce; a shortage merely implies that there isn't as much of something as people would like, which is nearly always the case.
d. There is no distinction between the two. They are the same thing.

Question 3
A decrease in supply means:
Choose one answer.
a. a shift to the left of the entire supply curve.
b. moving downward (to the left) along the supply curve with lower prices.
c. less will be demanded at every price.
d. more will be supplied at every price.

Question 4
A decrease in demand, with no change in supply, will lead to ________ in equilibrium quantity and ________ in equilibrium price.
Choose one answer.
a. an increase; an increase
b. an increase; a decrease
c. a decrease; an increase
d. a decrease; a decrease

Question 5
After graduation from college you will receive a substantial increase in your income from a new job. If you decide that you will purchase more T-bone steak and less hamburger, then for you hamburger would be considered a( n ):
Choose one answer.
a. normal good.
b. substitute good.
c. complementary good.
d. inferior good.

Question 6
There is equilibrium in the market when:
Choose one answer.
a. there is no shortage.
b. there is no surplus.
c. price is established where the supply curve and the demand curve intersect.
d. all of the above are true.

Question 7
Which would not cause the supply curve to shift?
Choose one answer.
a. a change in technology
b. a change in factor costs
c. a change in the price of the good
d. a change in the prices of related goods

Question 8
Given that meat and potatoes are complementary goods, if the price of meat decreases substantially, there would be:
Choose one answer.
a. an increase in the demand for potatoes.
b. an increase in the quantity of potatoes demanded.
c. a decrease in the demand for potatoes.
d. no change in the demand for potatoes.

Question 9
Given that milk and cookies are complements, suppose the price of flour (an ingredient in cookies) rises. What happens in the market for milk?
Choose one answer.
a. The equilibrium price and quantity rise.
b. The equilibrium price rises and the equilibrium quantity falls.
c. The equilibrium price and quantity fall.
d. The equilibrium price falls and the equilibrium quantity rises.

Question 10



A temporary price of $2 in this market would result in:
Choose one answer.
a. a surplus of 8,000 bushels.
b. a shortage of 8,000 bushels.
c. a shortage of 10,000 bushels.
d. a surplus of 10,000 bushels.

Question 11
The price of oranges rises. What happens in the market for apples, which are a substitute for oranges?
Choose one answer.
a. The equilibrium price falls, and the equilibrium quantity rises.
b. The equilibrium price rises, and the equilibrium quantity falls.
c. The equilibrium price and quantity rise.
d. The equilibrium price and quantity fall.

Question 12
A market surplus occurs if the:
Choose one answer.
a. price is below the equilibrium price.
b. price is equal to the equilibrium price.
c. equilibrium price is above the actual price.
d. equilibrium price is below the actual price.

1. A change in quantity supplied:

A. refers to a shift in the supply curve.

B. results from a change in a determinant of supply.

C. refers to a movement along a given supply curve.

D. is caused by a change in the number of sellers in the industry.

 

2. Which one of the following would most likely cause the supply curve for microwaves to shift to the right:

A. a decrease in the price of microwaves.

B. an increase in the wage rate earned by workers who produce microwaves.

C. a decrease in consumer preferences for microwaves.

D. an increase in the number of firms that produce microwaves

 

3. If the actual price sellers are pricing their goods at is currently above the equilibrium price. There is a ____________. Therefore, we would expect sellers to ____________ the price until the market reaches equilibrium.

A.

surplus; raise
B.

surplus; lower
C.

shortage; raise
 

D. shortage; lower

4. Suppose the demand and the supply of wine both increase. The net effect of these changes in demand and supply will be

A

an increase in equilibrium quantity, but a decrease in equilibrium price.
B

an increase in equilibrium price and quantity.
C.

an increase in equilibrium price, but the change in equilibrium quantity is indeterminate.
D.

an increase in equilibrium quantity, but the change in equilibrium price is indeterminate.