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# What is a positive relationship in mathematics? Description

##### Description: These notes cover the introduction to microeconomics, Chapter 1, Chapter 2, and Chapter 4 - everything we'll be tested on. :) I tried to explain everything in the simplest terms!
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## What is a positive relationship in mathematics?

ECON202 Exam 1 Study Guide CHENG

Introduction to Economics: (a mathematical review) • Graphical Relationships –

o Positive relationship: both x and y variables increase or decrease; upward sloping curve

o Negative relationship: x and y variables do the opposite of one another; as x  increases, y decreases (and vice versa); downward-sloping curve (looks like  the diagonal line in the letter N(egative))

• Movement Along a Curve –

o Point (x,y) will move along a curve as x and y change at the same time; this only  occurs when all other factors are held constant

• Shifting a Curve –

## What is a negative relationship in mathematics?

o If there is a positive relationship between two variables, then an increase in  one will cause a shift to the right

o If there is a negative relationship between two variables, an increase in one  causes it to shift to the left

• Calculating Area of a Rectangle –

o Length x Width

• Calculating Area of a Triangle –

o (1/2) x base of triangle x height of triangle

Chapter 1: Principles of Microeconomics

• Economics – the study of how human behavior contributes to the supply and  demand of its scarce resources; a social science

o Economics is used to predict:

## How to calculate the area of a rectangle?

▪ What needs to be produced

▪ How it should be produced

▪ How much should be produced

▪ How income should be distributed

o Three ways to interpret economic phenomena:

▪ Verbally We also discuss several other topics like What is stoicism?

▪ Graphically

▪ Mathematically

• Microeconomics vs. Macroeconomics –

o Microeconomics – the study of individuals and business decisions; the study  of how rational individuals/firms make optimal decisions under certain  constraints and how they interact in markets

o Macroeconomics – the study of the economy as a whole; the study of  economy-wide phenomena within the market

▪ How are they connected? – Economy-wide phenomena (i.e. a rise in  unemployment rates) are always due to the individual decision-maker;  the behaviors of individuals and firms determine the condition of the  overall marketIf you want to learn more check out How did the understanding of what it meant to be an american change from 1865 to 1939?

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• Principles of Microeconomics –

o For Individual Decision-Making:

• Rational people weigh benefits and costs of their actions; only

if benefits outweigh costs, they’ll act.

• Trade-offs are due to the scarcity of resources

• Major trade-off within society – efficiency vs. equality

o Efficiency – how to get the most out of our available

resources

o Equality – how to distribute these resources among  Don't forget about the age old question of What are the types of law?

regions and individuals

▪ For society to get the most out of its scarce

resources, sometimes the equal distribution of

resources must be sacrificed and vice versa

▪ For example, say a guy owns a bunch of oil rigs.

Can the profit he earns from the oil be distributed

equally among every citizen in the country? No,

that wouldn’t be very efficient, because now the

guy that own the rigs does not have the money to

keep producing the oil that was making the

money.

2. Whatever “yes” decision you make, you’re saying “no” to

several other options.

• The decisions you say “no” to are called opportunity costs;  Don't forget about the age old question of What is the marshall plan?

opportunity costs are the actions/results you miss out on

when you decide on another option.

• Not all costs are measured in money:

o Explicit costs – costs that involve a monetary

exchange; money that comes out-of-pocket

o Implicit costs – costs that do not affect money, but

other resources instead (like time, energy, etc)

3. Rational people think at the margin.

• Rationality – a rational person consistently takes account of

available information, probabilities of events, and

potential costs and benefits in determining a preference

o But what happens when a human acts irrationally? –

often times, the individual will learn from other rational

people how to be wiser with their resources, thus

adapting and making their own lives easier; basically,

irrationally will eventually become nonexistent

• Marginalism – analyzing additional (incremental) costs and

benefits arising from a decision

o If the marginal benefits outweigh the marginal costs, the

decision is a good one!Don't forget about the age old question of What are the knights of labor?

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• Diminishing Marginal Benefit/Return – the concept  that…the more we have of something, the less satisfaction  we get from it.

o For example, say you’re super hungry so you eat a slice  of pizza you rate how satisfied you are after that first  slice. Now, eat another slice. Rate your satisfaction. Now  eat a third and fourth slice and rate your satisfaction.  Eventually, you’ll start to get full and eating the pizza is a  lot less enjoyable.

# of slices

eaten

Satisfaction

rating

Marginal

benefit

1

5

5 – 0 = 5

2

8

8 – 5 = 3

3

9

9 – 8 = 1

4

6

6 – 9 = -3

o In the table, you can see how the marginal benefit  decreases with each slice of pizza you eat, even though  you were the most satisfied when you were eating that  third slice. This is the theory of diminishing marginal  benefit.  We also discuss several other topics like Where do carbohydrates come from?

• The Diamond & Water paradox –

o First of all, water is essential to life. Diamonds are not. So  why, then, are diamonds more valuable to us than  water?

o Scarcity is the root cause. If water were to become  scarce, people would pay big bucks for it and diamonds  would be considered less valuable.

o To analyze, compare the marginal costs and marginal  benefits of diamonds and of water. If you quantify the  satisfaction you receive from a diamond (say, you’ll get  \$5000 of satisfaction) and compare it to the actual cost of  the diamond (say it costs \$4000), then the net marginal  benefit you receive from the diamond is \$1000. Now, do  the same for a bottle of water. Say you quantify that a  bottle of water will give you \$3 of satisfaction and it costs  \$2. The net marginal benefit of a bottle of water is only  \$1. This is how rational individuals perceive and analyze  the values of different products.

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4. People respond to economic incentives.

• People are more likely to engage in an activity if they are

given some sort of motivation, even if marginal costs

outweigh marginal benefits

o For example, you may be less likely to drive over the

speed limit if you know you may be fined \$200 for doing

so. Let’s compare the costs and benefits of speeding.

▪ Benefits of speeding: you arrive at your

destination earlier (quantify your satisfaction; say

getting there earlier is equal to about \$3 in

benefits)

▪ Costs of speeding: you can get a ticket for \$200

o The costs clearly outweigh the benefits, so it’s irrational

to speed, right? Well, not if you factor in the probability

of getting pulled over by a cop… In this case, you would

multiply the cost of the ticket by the probability that

you’ll get pulled over (say that 1 in 1000 speeders will

get pulled over, so .01%). This calculation equals 20

cents. Now, compare that 20 cent marginal cost with the

\$3 marginal benefit, and you’ll see why everyone drives

over the speed limit.

o For Market and Economy Decision-Making:

1. Trade can make everyone better off.

• When people interact with each other in a market to exchange  goods and services, the market prospers and the individuals

prosper

2. Markets are usually a good way to organize economic activity. • Because market economies allocate resources through

individuals’ decisions (usually out of self-interest) instead of

from a centralized decision-maker, an “invisible hand”

moves the market and promotes general economic well

being

3. Governments can sometimes improve market outcomes.  • When people only us the market out of self-interest, sometimes  there is a trade-off that negatively affects other variables;

government can then step in to regulate the economy (i.e.

industrial factories produce quality items at low prices, but

they emit pollution that kills animals in the region, so the

government gives them rules to follow).

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Chapter 2: The Economist

• The Scientific Method of Economics –

o Observe economic phenomenon

o Formulate a theory/model that is testable

o Collect data and test the theory through empirical analysis

o Revise the theory if it fails to explain the data well

▪ Example: Do couples have more children when they earn more? This  is a testable question that can lead economists to an answer to this

phenomenon.

• Economic models/theories – when trying to understand economics, the answer to  most economic phenomena is knowing the causation of such phenomena.  Economists are required to simplify complex human behaviors by…

▪ Assuming away unnecessary details

▪ Understanding the simplest scenario first before adding

complexities to it

▪ Making assumptions to make things simple, then relaxing (or

specifying) these simple assumptions when analyzing complicated

scenarios

o The balance of economic models is extremely important.

▪ If a model is overbroad (meaning it includes too many moving

variables and not enough assumptions), an economist task of

explaining a phenomenon will be almost impossible.

▪ If a model is oversimplified (meaning it includes too many

assumptions), an economist will not come to an accurate conclusion

when testing his model/theory.

• Example: Say you need a map from your house to your next

class. Do you need a map that includes all of the trees, lakes,

buildings, etc all along your route? (Probably not, this would

be overbroad.) What if I gave you a map with a squiggly line

from point A to point B? (Not helpful either, because it’s

oversimplified.)

• Production Possibilities Frontier (PPF)

o This economic model explains efficient production possibilities, or the  allocation of 100% of available resources in the most

profitable/beneficial way

▪ It will demonstrate how a specific choice of action will result in an

efficient, inefficient, or unfeasible manner

• Efficient – economy uses ALL available resources to produce a

combination of 2 goods; the PPF is the set of all efficient

output combinations

• Inefficient – economy does NOT have to use all of its

resources to produce it, meaning there are resources

leftover; this point would be plotted BELOW the PPF line on a

graph)

• Infeasible (not possible) – economy cannot produce the

combination of goods, even if all resources are used (this point

would be plotted ABOVE the PPF line on a graph)

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o Example: Consider an economy that uses the scarce  resource (labor, measured by labor hours) to produce  computers and wheat. Assume the economy has 50,000  labor hours per month available for production. In  addition, producing one computer requires 100 hours  labor; producing one ton of wheat requires 10 hours  labor. Below are five production plans in terms of  allocating the 50,000 labor hours:

• A. 50,000 hours in producing computers +  0 hour in producing wheat

• B. 40,000 hours in producing computers +  10,000 hours in producing wheat

• C. 25,000 hours in producing computers +  25,000 hours in producing wheat

• D. 10,000 hours in producing computers +  40,000 hours in producing wheat

• E. 0 hour in producing computers + 50,000  hours in producing wheat

▪ From the information above, we know that we can  produce 500C/0W, 400C/1000W, 250C/2500W,  100C/4000W, or 0C/5000W. This is the PPF line  on the graph, because all labor hours would be  used in each output scenario.

▪ Say you wanted to produce 100C and 3500W. This  would be inefficient, because there would be  leftover labor hours that were not used. The point  would fall below PPF.

▪ Say you wanted to produce 300C and 3500W. This  would be infeasible, because you don’t have  enough labor hours available. The point would  fall above PPF. Remember, resources are scarce!

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Chapter 4: Demand and Supply

• Laws of Supply and Demand –

o Why do we need to understand these in the market?

▪ Helps determine market price of a product

▪ Helps determine the quantity of products needed in the market

o Markets – the environment in which a buyer and seller interact in the exchange  of goods, services, and payments

▪ Competitive markets – environment where multiple buyers and sellers  interact; results in the buyers/sellers having little to no impact on

market price

• Perfectly competitive markets – makes market analysis simple;

they don’t really exist in reality, but it serves as a

benchmark/baseline when we’re evaluating more complicated

market scenarios; characterized by the following features:

o Homogenous goods – goods in each category are the exact

same (e.g. a laptop is simply a laptop; there’s no MacBooks,

no Microsoft Studio…there are just..laptops)

o Price takers – buyers and sellers have no influence on the

market price of a good

o Law of Demand (LOD) – states that, when all other variables remain constant,  the quantity of a good decreases when its price increases; there is a  negative relationship between price and quantity demanded (downward  sloping curve)

• NOTE: In some instances, the demand curve CAN slope upward,

meaning that people will buy more when the price goes up. (e.g.

wealthy people might buy a luxury car that’s super expensive

because it’s a status symbol)

▪ Quantity Demanded (QD) – the amount of a good that buyers are willing  and able to purchase

▪ Market Demand Curves – can be determined when there are multiple  consumer’s being analyzed

• Example: Helen buys 8 lattes when they’re priced at \$4 a piece,

and Ken buys 4 lattes at \$4 a piece; when the lattes are \$5, Helen

buys 6 and Ken buys 3. Market demand curve is determined by

adding the quantities of Helen and Ken’s lattes that they bought at

the different price levels. So two of the points on the curve would

be (4, 12) and (5, 9)

▪ Change in Quantity Demanded vs. Change in Demand

• Change in QD – due to a change in the good’s price; curve itself

does NOT shift, only the point on the curve shifts from one position

to another

• Change in Demand – due to a change in ANY factors (“other

things”), excluding the good’s price; entire curve shifts from one

location on the graph to another (left or right of its original

position)

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o Demand shifters – the “other things” that can affect the  position of the demand curve; there are 5 demand shifters  we should be aware of:

▪ Number of buyers – when there are more buyers  present, there is an increase in demand, which shifts  the demand curve to the right (e.g. during football  season, there are more fans in town to buy Ole Miss  related goods)

▪ Levels of income –

• When income increases, demand increases for  normal goods like new cars (demand curve

shifts to the right)

• When income increases, demand decreases  for inferior goods like public transit (demand

curve shifts to the left)

▪ Prices of related goods –

• Substitutes (e.g. Coke and Pepsi) – if the

price of one substitute increases, the demand

for the OTHER substitute increases (curve for

good 2 shifts to the right)

• Complements (e.g. smartphones and apps) – if the price of a good increases, the demand

for its complement goods decreases (curve for

complement good shifts to the left)

▪ Tastes – when a consumer’s taste for certain  products changes,

▪ Expectations – sometimes there are events that  allow consumers to make predictions about price  changes (e.g. iPhone 7 comes out in September, so  we assume the price of iPhone 6s will go down in  September)

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o Law of Supply (LOS) – states that, when other factors are held constant, the  quantity of a good supplied increases when the price of a good increases  (sellers want to sell more when they’re selling their goods at a higher price);  there is a positive relationship between price and quantity supplied (upward  sloping curve)

▪ Quantity Supplied (QS) – the amount of a good that sellers are willing  and able to sell

▪ Change in Quantity Supplied vs. Change in Supply

• Like quantity demanded, when there is a change in the quantity  supplied, there will only be a move ALONG the curve; the curve  itself will not shift

• When there is a change in supply, it is due to factors other than  the price of the good and the entire curve can shift left or right

o Supply shifters – the “other things” that can affect the

position of the supply curve; there are 4 supply shifters we

should be aware of:

▪ Number of sellers – when there is an increasing

number of sellers in a market (regardless of price)

they will sell more, so the supply curve will shift to

the right

▪ Input prices – an increase in input prices (cost of

materials/labor to make a product) is less profitable

for the seller, so supply decreases; supply curve

shifts to the left

▪ Technology – advanced technology often makes

production easier and more profitable for sellers,

therefore supply increases and the supply curve

shifts to the right

▪ Expectations – if a producer/seller expects that his

product will become less and less desirable (say, an

MP3 player producer hears about the invention of the

iPod), he will increase supply now so he can sell as

many as he can before the iPod is released

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o Combining Supply and Demand

▪ Market Equilibrium – when sellers produce exactly as many goods as  the buyers will purchase; QS = QD

• Market Equilibrium Price/Market Clearing Price (P*) – the  price of a good when QS and QD are equal; basically the perfect  price that benefits sellers and suppliers equally

• Market Equilibrium Quantity (Q*) – the quantity of goods that  are supplied at that perfect price

• P* and Q* are located at the intersection of the demand and  supply curves

o Example: Market research has revealed the following

information about the market for chocolate bars: the

demand schedule/curve can be represented by the

equation Qd = 1600 – 300P; the supply schedule/curve can

be represented by the equation Qs = 1400 + 700P. What are

market equilibrium price and quantity?

▪ Set each equation equal to one another and solve for

P (price). Then substitute this value of P into one of

the individual equations to determine Q (quantity).

o What happens when the market is not in equilibrium?

▪ Surplus – excess supply; occurs when quantity supplied is greater than  quantity demanded; on a supply/demand graph, a surplus is any points  above the intersection

• To determine the surplus on the supply/demand graph, take the  higher quantity and subtract it from the lower quantity.

▪ Shortage – excess demand; occurs when quantity supplied is less than  quantity demanded; on a supply/demand graph, a shortage is any points  below the intersection

• To determine the shortage, take the higher quantity and subtract it  from the lower quantity.

▪ How does the market overcome shortages and surpluses?

• The market will cure itself with adjustments in price. If there is a  surplus of goods, sellers will lower the price, so people will  buy more. If there is a shortage of goods, the seller will raise

the price so less people are interested in the good. Rational  people rely on self-interest, which will eliminate any surpluses or  shortages.

• This concept is referred to as the market mechanism, which is  driven by the law of demand and the law of supply.

o The market mechanism only applies to a market economy,

and has no effect in a centrally-planned economy, where

the government has control over the production of goods

and the land they’re produced on.

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o Shifts in Supply and Demand – the factors of supply and demand determine  the equilibrium price and quantity. As these factors shift, the equilibrium price  and quantity will also change.

▪ DECREASES in DEMAND:

• Demand curve shifts to the LEFT because buyers are willing and  able to buy a lower quantity at each price.

• Possible causes:

o Fall in income

o Fall in the price of a substitute

o Rise in the price of a complement

• Results in:

o Lower equilibrium price

o Lower equilibrium quantity

• If the demand decreases, for example a particular style of

sunglasses becomes less popular, (i.e., a change a tastes and

preferences), the quantity demanded at each price has

decreased. At the current price there is now a surplus in the

market and pressure for the price to decrease. The new

equilibrium will be at a lower price and lower quantity. Note that  the supply curve does not shift but a lower quantity is supplied  due to a decrease in the price.

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▪ INCREASES in DEMAND:

• Demand curve shifts to the RIGHT because there’s an increase in  QD at every price.

• Possible Causes:

o Rise in income

o Rise in the price of a substitute good

o Fall in the price of a complement good

• Results in:

o Higher equilibrium price

o Higher equilibrium quantity

• If the demand curve shifts right, there is a greater quantity  demanded at each price, the newly created shortage at the  original price will drive the market to a higher equilibrium price  and quantity. As the demand curve shifts the change in the  equilibrium price and quantity will be in the same direction, i.e.,  both will increase.

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▪ DECREASE in SUPPLY:

• Supply curve shifts LEFT because suppliers are willing and able to  supply a lower quantity at each possible price.

• Possible Causes:

o Expectations of a future rise in price

o Less sellers in the market

o Increase in input prices

• Results in:

o Higher equilibrium price

o Lower equilibrium quantity

▪ If the supply curve shifts left, say due to an increase in the price of the  resources used to make the product, there is a lower quantity supplied at  each price. The result will be an increase in the market equilibrium price  but a decrease in the market equilibrium quantity. The increase in price,  causes a movement along the demand curve to a lower equilibrium  quantity demanded.

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▪ INCREASE in SUPPLY:

• Supply curve shifts RIGHT because suppliers are willing and able  to supply a higher quantity at each price.

• Possible causes:

o Expectations of a future drop in price

o More sellers in the market

o Decrease in input prices

• Results in:

o Lower equilibrium price

o Higher equilibrium quantity

• A rightward shift in the supply curve, say from a new production  technology, leads to a lower equilibrium price and a greater  quantity. Note that as the supply curve shifts, the change in the  equilibrium price and quantity will be in opposite directions.

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o What happens to equilibrium when supply and demand curves shift at the same  time?

▪ For either price or quantity, if all changes are in the same direction,  then the cumulative change will be in that direction.

▪ If changes go in opposite directions, the cumulative changes will be  unknown, or indeterminate. Changes in opposite direction are

indeterminate unless you know which change is larger.

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Review questions for EXAM 1:

1.Which of the following statements is correct? …Buyers  determine demand, and sellers determine supply.

2. For a market for a good or service to exist, there must be  a …group of buyers and sellers.

3.A competitive market is a market in which…no  individual buyer or seller has any significant impact  on the market price.

4. If a seller in a competitive market chooses to charge  more than the going price, then…buyers will make  purchases from other sellers.

5. In competitive markets, which of the following is NOT  correct? …Some sellers can set prices.

6.A movement upward and to the left along a demand  curve is called a(n)…decrease in quantity demanded.

7.When the price of a good or service changes, …there is  a movement along a given demand curve.

8. The movement from point A to point B on the graph  shows…an increase in quantity demanded.

9.When we move along a given demand curve, …all non price determinants of demand are held constant.

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10. When quantity demanded decreases at every  possible price, the demand curve has …shifted to the  left.

11. The market demand curve…represents the sum of  the quantities demanded by all the buyers at each  price of the good.

12. To obtain the market demand curve for a product,  sum the individual demand curves…(not sure on this  one, but it’s not diagonally or vertically, lol)

13. If Consumer A and Consumer B are the only  consumers in a market, then the market quantity  demanded when the price is \$6 is…12 units.

14. The shift from D to D’ is called…a decrease in  demand.

15. If the demand curve shifts from D to D’, then…(not  sure on this one either ☹)

16. The movement from D to D’ could be caused by…a  decrease in the price of a substitute.

17. The movement from D’ to D could be caused  by…(idk, sorry.)

18. The movement from D’ to D in the market for potato  chips could be caused by a(n)

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19. Which of the following changes would NOT shift the  demand curve for a good or service? …a change in the  price of the good or service.

20. Soup is an inferior good if the demand…for soup  falls when income rises.

21. Suppose that a decrease in the price of good X  results in fewer units of good Y being demanded. This  implies that X and Y are…substitute goods.

22. If toast and butter are complements, then which of  the following would increase the demand for toast? …a  decrease in the price of butter.

23. Suppose scientists provide evidence that chocolate  pudding increases the bad cholesterol levels of those  who eat it. We would expect to see…a decrease in the  demand for chocolate pudding.

24. Ford Motor Company announces that next month it  will offer \$3000 rebates on new Mustangs. As a result of  this information, today’s demand curve for

Mustangs…shifts to the left.

25. A movement along the supply curve might be  caused by a change in…the price of the good or service  that is being supplied.

26. A supply curve slopes upward because…an  increase in price gives producers an incentive to  supply a larger quantity.

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27. When quantity supplied decreases at every possible  price, we know that the supply curve has…shifted to the  left.

28. Which of the following changes would not shift the  supply curve for a good or service? …a change in the  price of the good or service.

29. In a market, to find the total amount of supplied at a  particular price, we must…sum the quantities that  individual firms are willing and able to supply at that  price.

30. A market supply curve shows…the total quantity  supplied at all possible prices.

31. Which supply schedules obey the laws of supply?  …Firm B’s and Firm D’s only.

32. If these are the only four sellers in the market, then  the market quantity supplied at a price of \$4 is…30 units.

33. Workers at a bicycle assembly plant currently earn  the mandatory minimum wage. If the federal government  increases the minimum wage by \$1 per hour, then it is  likely that the…supply of bicycles will shift to the left.

34. An improvement in production technology  will…decrease a firm’s costs and increase its supply.

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35. If suppliers expect the price of their product to fall in  the future, then they will…increase supply now.

36. A decrease in the number of sellers in the market  causes…the supply curve to shift to the left.

37. The shift from S to S’ could be caused by  a(n)…improvement in production technology.

38. The shift from S to S’ in the market for peaches could  be caused by a(n)…decrease in the labor costs of the  workers who pick peaches.

39. The shift from S’ to S in the market for chocolate cake  could be caused by a(n)…decrease in the number of  commercial bakers.

40. At the equilibrium price, the quantity of the good  that buyers are willing and able to buy…exactly equals  the quantity that sellers are willing and able to sell.

41. If the demand can be represented by the equation  QD = 2400-200P and supply can be represented by the  equation QS = 2000+200P, what are the equilibrium price  and quantity? …P=1; Q=2200

42. In markets, prices move toward equilibrium because  of…the actions of buyers and sellers.

43. When the price of a good is higher than the  equilibrium price, …sellers desire to produce and sell  more than buyers wish to purchase.

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44. When a surplus exists in a market, sellers…lower  price, which increases quantity demanded and  decreases quantity supplied until the surplus  disappears.

45. Suppose roses are currently selling for \$20 per  dozen, but the equilibrium price of roses is \$30 per  dozen. We would expect a…shortage to exist and the  market price of roses to increase.

46. The law of supply and demand asserts that…the  price of a good will eventually rise in response to an  excess demand for that good.

47. If there is currently a shortage of 20 units of the  good, then the law of …supply and demand predicts  that the price will rise by \$2 to eliminate the shortage.

48. The equilibrium price and quantity, respectively,  are…\$6 and 30 units.

49. If the price were \$8, a…surplus of 25 units would  exist, and price would tend to fall.

50. If the price were \$4, a…shortage of 25 units would  exist, and price would tend to rise.

51. Which of the following events must cause  equilibrium quantity to fall? …demand and supply both  decrease.

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52. If the demand for a product decreases, then we  would expect equilibrium price…and equilibrium  quantity to both decrease.

53. Suppose that demand for a good increases and, at  the same time, supply of the good decreases. What  would happen in the market for the good?

…Equilibrium price would increase, but the impact  on equilibrium quantity would be ambiguous.

54. If scientists discover that steamed milk, which is  used to make lattes, prevents heart attacks, what would  happen to the equilibrium price and quantity of lattes?  …both the equilibrium price and quantity would  increase.

55. What would happen to the equilibrium price and  quantity of peanut butter if the price of peanuts goes up,  the price of jelly falls, fewer firms decide to produce  peanut butter, and health officials announced that eating  peanut butter was good for you? …price will rise and  the effect on quantity is ambiguous.

56. All else equal, an increase in the income of buyers  who consider turkey to be an inferior good would cause  a move from…DA to DB.

57. All else equal, in increase in the number of turkey  sellers would cause a move from …y to x.

58. Robb only has \$100 to spend. He wants to buy either  a new jacket for his trip to Colorado, or a pair of Beats so

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he can listen to music on his trip. Both items cost \$100, so  he can only buy one or the other. What principle of  microeconomics does this illustrate? People face trade offs.

59. A typical society strives to make the most of its  limited supply of resources, but also wants to distribute  the benefits of these resources fairly among the  members of society. This illustrates society’s trade-off  between: efficiency and equality.

60. High-school athletes who skip college to become  professional athletes… understand that the opportunity  cost of attending college is very high.

61. A rational decision-maker takes an action only if  the… marginal benefit is greater than the marginal  cost.

62. You’re considering staying in college for an extra  semester to receive an additional degree in economics.  In deciding whether or not to stay, you should…  compare the cost of staying another semester to the  benefits of staying another semester.

63. People are likely to respond to a policy change if…  the policy alters either the costs or the benefits of  their typical behavior.

64. What do we mean by “There ain’t no such thing as  free lunch”? Kendra must decide between going to

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Colorado or Cancun for spring break. (I THINK this is  the right answer….)

65. Denise decides to work overtime for 3 hours at  \$10/hour instead of seeing a movie with her friends. Her  opportunity cost of working is…the enjoyment she  would have received if she has seen the movie with  her friends.

66. Bob has 2 cars. Bob wants to buy a third car. What is  Bob’s marginal benefit from purchasing another car? The  total benefit he receives from purchasing 3 cars,  minus the total benefit he received from purchasing  the first 2 cars.

67. People are willing to pay more for a diamond than  for a bottle of water because… the marginal benefit of  an extra diamond far exceeds the marginal benefit of  an extra bottle of water.

68. Suppose Oxford were to raise the tax rates on liquor.  As a result, people drive to Batesville to get liquor for a  better price. Which microeconomic principle does this  best illustrate? People respond to incentives.

69. One thing economists do to help them understand  how the real world works is… make assumptions.

70. Economists make assumptions to… make a  complex world easier to understand.

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71. An economic theory about international trade that is  based on the assumption that there are only two  countries trading two goods… can be useful in helping  economists understand the complex world on  international trade involving many countries and  many goods.

72. Which of the following statements about economic  models is correct?... Because economic models omit  many details, they allow us to see what is truly  important.

73. Suppose a nation is currently producing at a point  inside its production possibilities frontier. We know  that... the nation is not using all of its available  resources.

74. If this economy devotes all of its resources to the  production of clocks, then it will produce… 16 clocks  and 0 candles.

75. This economy has the ability to produce at which  points?... A, B, C, F, G

76. If the resource is not fully utilized (e.g.,  unemployment), could this economy produce at which  point(s)?... C, F, G

77. What is the opportunity cost of moving from point A  to point B?... 15 candles.

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78. For this economy, as more and more clocks are  produced, the opportunity cost of an additional clock  produced (in terms of candles)… increases.

79. The movement from point B to point D could NOT be  caused by… unemployment.

80. Which of the following events would explain the shift  of the production possibilities frontier from A to B?... The  economy experienced a technological advance in the  production of books.

81. When a production possibilities frontier is bowed  outward, the opportunity cost of producing an additional  unit of a good… (not sure… will update when I know the  answer!)

82. If the production possibilities frontier is bowed  outward, then "?" could be… (not sure, will update when  I know the answer!)

83. Production possibilities frontiers are usually bowed  outward. This is because… it reflects the fact that the  opportunity cost of producing a good decreases as  more and more of that good is produced.

84. Which of the following is an example of a positive, as  opposed to normative, statement?... When the quantity  of money grows rapidly, inflation is a predictable  consequence.

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