ECON 103 Lecture Notes - Lecture 18: Demand Curve, Diminishing Returns, Equilibrium Point

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10 Sep 2016

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Big ideas: movement along the supply curve where output changes in response to price, the supply curve moves when there is a change in output at the same price. This is in response to changes in the costs of inputs or technology: changes in p and q may give clues to underlying changes in supply and demand curves if we believe market are in equilibrium. The amount supplied increases because, at higher prices, firms move up their mc curve. They supply more because at higher prices they can hire more variable inputs, increasing production even at diminishing marginal productivity. Supply curves move more, or less, supplied at any price. Moving supply curves by raising and lowering wages. If wages rise then producers will supply the same amount only at higher prices; the supply curve shifts in. If wages fall, they will supply more at the same price and the supply curve shifts out.

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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?"

purpleworm770

In the early part of the last decade, there was an overproductionof coffee. The price dropped so low that producers' costs werehigher than the market price. The reason this happened was thatmarket prices became high before this, and the supply of coffeeincreased substantially. In the meantime, demand for coffee andeverything else remained the same. Price Level 1.

Coffee prices came down again, at first overshooting the formerequilibrium price, throwing the coffee market into confusion. Inthe meantime, gourmet coffee houses began appearing, which begancharging a premium for coffee in the period of falling prices.Price Level 2.

Gourmet coffee houses tend to open in high-rent areas and cater tohigher income consumers. Because of the change they created fortaste and preferences and the higher income market, the gourmetcoffee houses had a win-win in a period of falling wholesale pricesand increasing retail prices. Price Level 3.

But in the middle of the decade, the party was over, and wholesaleprices started increasing because of some shortages caused byweather and the rising overall market prices again. Where is thenew equilibrium price? Price Level 4.

Explain the changes in the supply and demand curves based on theabove information. Draw a graph showing how the changes affect theprice levels, supply and demand.

Scenario Two

You have been asked to discuss the differences between themicroeconomic definitions of supply and demand and themacroeconomic differences of aggregate supply and demand. Discusswhat determines supply and demand and aggregate supply andaggregate demand. Explain what causes movements along the curve andshifts in the curve for supply and demand and aggregate supply andaggregate demand (make sure that you include price as a variable).Include whether this is an example of the microeconomic definitionof supply and demand or the macroeconomic definition of aggregatesupply and demand. Most importantly, did this cause a shift in thecurves or a movement along the curves? What happened to equilibriumprice, supply, demand, aggregate supply or aggregate demand?Describe your graphs.

After Hurricane Katrina, what happened to the price of fish?
After the development of the microchip, what happened to the priceof computers?
After the government raised tariffs on imported cheese, whathappened to the price of domestic cheese?
Polyester suits have become trendy again. What happens to theirprice?
Internet auction sites are becoming more popular, and people areusing them more and more.
An new health report came out that said red wine lowerscholesterol.
The government raises taxes.
Inflation increases.
Immigration laws are relaxed.
The government increases spending.
Scenario Three

The PPF curve shows the economic choices a country can make aboutproduction given scarce resources, a given technology, and a givenquantity of inputs. Assume you are a developing country, producingfood and clothing at maximum capacity. What could happen whenforeign investors start investing in your country?

Discuss what type of foreign investments would be best for theeconomy

orchidbee801

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

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ECON 103 Lecture Notes - Lecture 18: Demand Curve, Diminishing Returns, Equilibrium Point

ECON 103 Full Course Notes

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