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==Unit 1== ==: Introduction to Economics==
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@@1.1 : Scarcity@@
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@@1.2: Resource Allocation and Economic Systems@@
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@@1.3: Production Possibilities Curve@@
Production possibilities curve (PPC) : illustrates the trade-offs that faces an economy, compares only two goods
Trade-offs : giving up something for something else
If the PPC is linear, it has a constant opportunity cost, if it is curved, it has increasing opportunity costs
Economic growth : a sustained rise in aggregate output and an increase in standard of living (causes are developments in technology, or an increase in resources)
Productive efficiency : lowest cost possible on the PPC
Allocative efficiency : the economy allocates resources so consumers are well off as possible, producing what is demanded
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@@1.4: Comparative Advantage and Trade@@
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@@1.5: Cost-Benefit Analysis@@
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@@1.6: Marginal Analysis and Consumer Choice@@
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==Unit 2== ==: Supply and Demand==
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@@2.1: Demand@@
Demand is downwards sloping
Law of demand : As price increases, demand decreases, and as price decreases, demand increases
Movement along the curve : change in price
Shifters of demand :
Substitution effect : as the price of a good increases, consumers substitute the good with another that is cheaper
Substitutes : good/service that can be used in place of another, when price of one increases, consumers will buy more of the other (ex. coffee and tea)
Complements : goods/services that are consumed together (ex. hamburgers and buns)
Income effect : as income increases, people will buy more of normal goods, and less of inferior goods
Normal good : increase in demand when consumer’s income increases (ex. oreos)
Inferior good : increase in demand when consumer’s income decreases (ex. off brand oreos)
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@@2.2 : Supply@@
Supply is upwards sloping
Law of supply : as price increases, quantity supplied also increases
Movement along the curve : change in price
Shifters of supply :
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@@2.3: Price Elasticity of Demand@@
Equation : %∆Qd/%∆P
Midpoint formula : Qd2-Qd1/(Q2d+Qd1)/2 , replace with Qd with price for price
Inelastic demand : TR correlates direct with price
Elastic demand = TR correlates inversely with price
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@@2.4: Price Elasticity of Supply@@
Equation : %∆Qs/%∆P
0 = perfectly elastic,
Inelastic : unable to respond to price change
Elastic : short run
Extremely elastic : long run
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@@2.5: Other Elasticities@@
1 = income elastic, <1 = income inelastic, negative = inferior, positive = normal
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@@2.6: Market Equilibrium and Consumer and Producer Surplus@@
Equilibrium : occurs when no one is better off doing something else
Equilibrium = Qs=Qd
Price below the equilibrium is shortage
Consumer surplus : price consumers are willing to pay - actual price
Producer surplus : actual price -price the producer is willing to sell for
Demand increase : price and quantity increase
Demand decrease : price and quantity decrease
Supply increase : price decreases, quantity increases
Supply decrease : price increases, quantity decreases
Double shift : either price or quantity will be unknown
Deadweight loss (DWL) : transactions that should occur, but don’t because of government intervention (calculate the area = triangle formula, ½(base x height)
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@@2.7: Market Disequilibrium and Changes in Equilibrium + 2.8: The Effects of Government Intervention in Markets@@
Shortage : Qs < Qd, price is lower than equilibrium
Surplus : Qs > Qd, price is above equilibrium
Price floor : minimum price a supplier can charge, price is set above equilibrium (causes shortage)
Price ceiling : maximum price a supplier can charge, price is set below equilibrium (causes surplus)
Double shift rule : when supply and demand both shift, either price or quantity will be unknown
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Quota : upper limit of a quantity that can be bought or sold (known as quantity control)
License : gives an owner the right to supply a good/service
Demand price : the price at which consumers will demand that quantity
Supply price : the price at which producers will supply that quantity
Quota rent : difference between demand price and supply price
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@@2.9: International Trade and Public Policy@@
Tariffs : tax placed on a good that is imported or exported
Import quota : restriction on the quantity of a good that can be imported
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==Unit 3:== ==Production, Cost, and the Perfect Competition Model==
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@@3.1: The Production Function@@
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@@3.2: Short-Run Production Costs@@
Fixed cost : cost that doesn’t change with amount of output produced (ex. oven)
Variable cost : cost that changes with amount of output produced
Total cost : fixed cost + variable cost
Marginal cost : cost difference of one additional unit of output (∆TC/∆Q)
Average fixed cost (AFC) : FC/Q
Average variable cost (AVC) : VC/Q
Average total cost (ATC) : TC/Q
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@@3.3: Long-Run Production Costs@@
Long run average total cost (LRATC) : same as short run ATC, but bigger
Economies of scale : LRATC declines as output increases
Diseconomies of scale : LRATC increaess as output increases
Constant returns to scale : output increase directly in proportion to an increase in all inputs (ex. input doubles, output also doubles)
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@@3.4: Types of Profit@@
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@@3.5: Profit Maximization@@
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@@3.6: Firms’ Short-Run Decisions to Produce and Long-Run Decisions to Enter or Exit a Market@@
Short Run:
Long Run :
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@@3.7: Perfect Competition@@
Many firms, identical products, low/no barriers to advertisement
Price takers
Long run will have normal profit
Short run can have either profit or loss
==Unit 4:== ==Imperfect Competition==
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@@4.1: Introduction to Imperfectly Competitive Markets@@
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Perfect Competition | Monopolistic Competition | Monopoly | Oligopoly | |
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# of firms | Many | Many | 1 | Few |
Type of product | Standard | Differentiated | Unique | Standard or different |
Price control | None | Little | Yes | Some |
Barriers to entry | None | None (few) | High | High |
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@@4.2: Monopoly@@
Only producer of a good, has no close substitutes
Downwards sloping demand curve
Quantity is produced : @ MR = MC
Price is : MR=MC, up to demand
Supply curve : where MC > AVC
Allocatively efficient due to them producing at MR=MC
Productively inefficient because they don’t produce at the minimum of the ATC
Natural monopoly : has large fixed costs, and long economies of scale, has downward sloping ATC curve
Natural monopoly production point : MR=MC
Government will correct by forcing them to set price : @ ATC=D
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@@4.3: Price Discrmination@@
To be able to price discriminate, you need market power
Imperfect price discrimination : chargine consumers different prices based on the buyer’s willingness to pay
Perfect price discrimnation : charges all consumers the maximum they are willing to pay, no deadweight loss, produce @ P=MC
Example : resellers, coupons, bulk buying (costco), etc.
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@@4.4: Monopolistic Competition@@
Characteristics
Combines features of both a monopoly and perfect competition
Many sellers and differentiated products
Will use advertising to make demand more inelastic + differentiate product
Makes profit in short run, normal profit in long run
Allocatively inefficient (P does not equal MC)
Productively inefficient (does not produce @ minimum of ATC, until long run)
Downwards sloping demand curve
Produce at MR = MC, price is MR = MC up to demand
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Long Run
Normal profit in long run
Short run profits will attract new firms to join, which decreases the demand until the demand Curve is tangent to ATC, causing normal profits in long run
In long run, they produce in region where economies of scales exist, because they produce in declining portion of ATC
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@@4.5: Oligopoly and Game Theory@@
Oligopoly Characteristics
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Game Theory
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Player B | |||
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Choice 1 | Choice 2 | ||
Player A | Choice 1 | A1,B1 | A2,B2 |
Choice 2 | A3,B3 | A4,B4 |
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==Unit 5: Factor Markets==
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@@5.1: Introduction of Factor Markets@@
@@5.2: Changes in Factor Demand and Factor Supply@@
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@@5.3: Profit-Maximizing Behavior in Perfectly Competitive Factor Markets@@
Market curve : standard supply and demand curve
Equilibrium wage in the market : establishes the wage that firms will pay workers
MRP=MRC!!!!
will not hire if MRC>MRP
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@@5.4: Monopsonistic Markets@@
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==Unit 6: Market Failure and the Role of Government==
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@@6.1: Socially Efficient and Inefficient Market Outcomes@@
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@@6.2: Externalities@@
Externality : when external cost/benefit is placed on members of society who did not pay for them
MSB does not equal MSC
Negative externality : when someone uses a product, it decreases the benefit of others (ex. smoking), MSC > MPC (correct with per unit tax)
Positive externality : when one uses a product, others benefit (ex. education) MSC < MPC (correct with subsidy)
@@6.3: Public and Private Goods@@
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@@6.4: The Effects of Government Intervention in Different Market Structures@@
Causes of inefficient markets
Forms of government intervention
Per unit subsidy : gives benefits per unit
Lump sum subsidy : gives benefit no matter how many units
Taxes will always shift supply curve to the left in long run, profits decrease
Per unit tax : increase MC, ATC, and AVC
Lump sum tax : only increase ATC
won’t change output level
Non price regulation : works like taxes, they ensure competition/environmental protection/health and safety
Antitrust policy : promote competition and prevents monopolies
Antitrust laws
Price ceiling : sets minimum price
Price floor : sets maximum price
6.5: Inequality
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