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ECON 1115 Lecture Notes - Lecture 5: Economic Equilibrium, Shortage, Excess Supply

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School
Northeastern University
Department
Economics
Course
ECON 1115
Professor
Shi Xiao Lin

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Document Summary

Why does the demand curve slope downward: Income effect (when prices go up, the purchasing power of your income goes down, and so you would buy less, which results into a drop in quantity demanded) Diminishing marginal utility (the more you consume a good/use a service, the less satisfied you will be with additional consumption of the same good/service, which results into a drop in quantity demanded) Demand curve number of buyers, income/wealth*, price of related goods**, expectations. Supply curve cost of production/input price (inverse relationship with supply), taxes (inverse relationship with supply), subsidies, number of sellers, expectations and technology. *normal good vs inferior good with more money, you will buy more normal goods. **two types include complemental (example, pencil and eraser; if the pencil"s price increases, the eraser"s price increases) and substitutes (example, frozen yogurt and ice cream; if ice cream"s price increase, frozen yogurt"s price decreases) Endogenous vs exogenous demand vs quantity demanded:

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Related Questions

When demand for a good is very elastic, revenue ________ when the price falls.

(2)

An elasticity measure less than one means that demand is __________.

(3)

An elasticity measure greater than one means that demand is __________.

(4)

The Latin expression ceteris paribus means

having made all other necessary changes.

holding constant all other variables.

assuming all households have similar incomes.

given the level of income in the economy.

(5)

A variable measured in terms of money is called a ____________________.

real variable

nominal variable

macroeconomic variable

microeconomic variable

(6)

Which of the following is true about the importance of money in economics?

Money is important in both macroeconomics and microeconomics.

Money is important in macroeconomics but not microeconomics.

Money is important in microeconomics but not macroeconomics.

Money is not important in either microeconomics or macroeconomics.

(7)

What is the difference between normative and positive economics?

Positive economics is descriptive and predictive; normative economics is prescriptive.

Positive economics highlights the positive aspects of the economy; normative economics highlights the average features.

Positive economics studies the actions of individuals; normative economics studies the actions of households.

Positive economics is an applied social science; normative economics is a theoretical social science.

(8)

The slope of the demand curve is negative because

the quantity of a good demanded decreases as income declines.

the quantity of a good demanded increases as income declines.

the quantity of a good demanded increases as the price declines.

the quantity of a good demanded decreases as the price declines.

(9)

What is the result of an increase in the price of bread, a normal good?

The demand curve shifts to the right.

The demand curve shifts to the left.

The quantity demanded increases.

The quantity demanded decreases.

(10)

What is the effect on demand for bread when the price of bagels, a substitute for bread, rises?

The demand curve for bread shifts to the right.

The demand curve for bread shifts to the left.

The quantity of bread demanded increases.

The quantity of bread demanded decreases.

(11)

Which of the following would cause the supply curve for bread to shift inward?

An increase in the price of bread

An increase in the price of bagels

A decrease in the price of bread

An increase in the price of flour

(12)

An improvement in technology shifts the supply curve outward because

at every price, firms find producing the good to be more profitable.

the price of the good increases.

at every price, firms find producing the good to be less profitable.

the price of the good decreases.

(13)

Which of the following factors does not affect how much bread a baker is willing to produce?

The price of bread

The demand for bread

The cost of inputs

Technology

(14)

How do expectations of prices affect how much of a good producers are willing to sell?

Expectations of prices affect only demand, not supply.

Actual prices, not expectations of prices, affect supply.

If producers expect prices to fall in the future, they supply less at every price.

If producers expect prices to rise in the future, they supply less at every price.

(15)

When the price of a good is above equilibrium level,

the quantity demanded exceeds the quantity supplied.

the quantity supplied exceeds the quantity demanded.

the supply curve shifts to the left.

the supply curve shifts to the right.

(16)

At a price of P0 in the diagram below, which of the following statements is true?

Supply equals demand.

There is excess demand.

There is excess supply.

There is scarcity.

(17)

If demand for bread increases at every price, the equilibrium price of bread will

fall.

rise.

remain unchanged.

depend on income.

(18)

If the demand for bread declines, then

at the original equilibrium price, there is excess demand.

at the original equilibrium price, there is excess supply.

the supply curve shifts to the right.

the supply curve shifts to the left.

(19)

Peanut butter and jelly are complementary goods. When the price of peanut butter rises, the demand for jelly ________ and the price of jelly ________.

rises; falls

rises; rises

falls; rises

falls; falls

(20)

The measure of elasticity that economists use is

always a positive number.

always a negative number.

positive when demand is elastic and negative when demand is inelastic.

negative when demand is elastic and positive when demand is inelastic.

(21)

Which of the following formulas is the correct expression for the slope of a line?

(22)

Graphically how would an increase in income affect the demand for hamburgers?

The slope of the demand curve would increase.

The slope of the demand curve would decrease.

The demand curve would shift outward, parallel to the original demand curve.

The demand curve would shift inward, parallel to the original demand curve.

(23)

Given the equation P = $6.00 ? $.40Q, where P is the price of the good and Q is the quantity of the good demanded, how many units will this consumer demand if the price is $3.60?

1.44 units

3 units

3.6 units

6 units

(24)

Which of the following is true about unit elasticity?

Revenues remain unchanged when the price changes.

Elasticity of demand increases as one moves down the demand curve.

Elasticity of demand decreases as one moves down the demand curve.

The elasticity of demand is greater than one at every point along the demand curve.

(25)

Which of the following could be a determinant of the quantity demanded of a good?

The price of the good

The price of related goods

Income

Expectations about the future price of the product

All of the above

1. In economics, the demand for a good refers to the amount of the good that people:
a. Will buy at alternative income levels
b. Need to achieve a minimum standard of living.
c. Will buy at various prices
d. Would like to have if the good were free
2. The term ceteris paribus means that:
a. What is for the individual is not necessarily true for the whole
b. All variables except those specified are constant
c. Everything is variable
d. No one knows which variables will change and which will remain constant.
3. When economist talk about supply, they are referring to a relationship between price received for each unit sold and the ____________________.
a. Quantity supplied
b. Demand schedule
c. Demand curve
d. Market price
4. But nearly all supply curves share a basic similarity: they slop______________.
a. Up from left to right
b. Down from left to right
c. Up from right to left
d. Down from right to left
5. The nature of demand indicates that as the price of a good increases:
a. Suppliers wish to sell less of it.
b. Buyers desire to purchase less of it
c. More of it is desired
d. More of it is produced
6. Any given demand or supply curve is based on the certeris paribus assumption that _______.
a. Everything is variable
b. All else is held equal
c. No one knows which variables will change and which will remain constant
d. What is true for the individual is not necessary true for the whole.
7. Economist refer to the relationship that a higher price leads to lower quantity demand as the ______________.
a. Price model
b. Law of demand
c. Market equilibrium
d. Income gap
8. A perfect elastic supply curve is:
a. Vertical
b. Downward sloping to the left
c. Horizontal
d. Upward sloping to the right
9. A 10 percent increase in the price of soda leads to a 20 percent increase in the quantity of iced tea demanded. It appears that:
a. Elasticity of demand for iced tea is 2 and is elastic
b. Cross-price elasticity of demand for iced tea is -2
c. Cross-price elasticity of demand for soda is -0.5
d. Elasticity of demand for soda 0.5 AND IS INELASTIC
10. ___________ is the change in what is on the horizontal axis (quantity) divided by the change in what is the vertical axis (price).
a. Elasticity
b. Supply
c. Demand
d. Revenue
11. A severe freeze has once again damaged the Florida orange crop. The impact on the market for orange juice will be a leftward shift of:
a. The supply curve and the rightward shift of the demand curve resulting in a higher equilibrium price
b. Both the supply and demand curves
c. The supply curve
d. The demand curve, as consumers try to economize because the shortage.
12. Got the answer.
13. A drought decreases the supply of agricultural products, which means that at any given price a lower quantity will be supplied; conversely, especially good weather would shift the _____________.
a. Demand curve to the right
b. Supply curve to the left
c. Supply curve to the right
d. Demand curve to the left
14. Interpret the following statements:

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.