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perfect compettion
answer
...
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monopolistic competition
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Large number of firms
Each firm produces good/service that they think is unique
Relatively easy for new firms to enter
Imperfect information
Each firm produces good/service that they think is unique
Relatively easy for new firms to enter
Imperfect information
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Oligpoly
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Few, large, mutually interdependent firms
Firms may produce similar or highly differentiated products
significant barriers to new entry
imperfect information
Firms may produce similar or highly differentiated products
significant barriers to new entry
imperfect information
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Monopoly
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One firm producing a good/service with no substitutions
New entry is blockaded
Imperfect infomation
New entry is blockaded
Imperfect infomation
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Demand Function
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The cheaper something is, the more of it people will be demanded. More expensive it is, less of it will be demanded.
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Giffen Goods
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the more expensive the good, the more people will demand it. Ex. Pearls
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Why do managers focus on price?
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It is the factor that is within management's control. And it is the most important factor in determining demand.
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Nonprice factors influencing demand
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Tastes and preferences
Consumer's income level
Future expectations of price (if you think price is going to drop in the future, you buy less of it now)
Number of potential consumers
Consumer's income level
Future expectations of price (if you think price is going to drop in the future, you buy less of it now)
Number of potential consumers
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Infierior good
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The richer you are, the less you buy of it. The poorer you are, the more you buy of it. Ex. Raman noodles
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Normal Good
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the richer you are, the more you're able to afford it. The poorer you are, the less able you are to afford it. Ex. Steak
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Substitute Goods
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Using one product in place of another, interchangeable. Ex: pizza and spaghetti
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Complementary goods
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Products or services that consumers use together. Ex: peanut butter and jelly, computers and printers, pizza and beer
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Demand curves
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Downward sloping, with a negative relationship between the price or a good and the quantity demanded
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Shift in demand curve
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Change (increase) in demand. Shift occurs for any other reason. Ex: study of wine makes demand increase bc people's tastes and preferences change.
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Movement along demand curve
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change (increase) in quantity demanded. Only occurs because of change in price.
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Elastic Demand
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sensitive to price
> 1
DO not increase prices, you will lose revenue
If you drop prices, you will get higher revenue
Decrease elastic
> 1
DO not increase prices, you will lose revenue
If you drop prices, you will get higher revenue
Decrease elastic
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inelastic demand
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insensitive to price
<1
Jack up the price to make money. Demand will only fall a little bit and revenue will go way up.
price decrease results in lower total revenue
Increase inelastic
<1
Jack up the price to make money. Demand will only fall a little bit and revenue will go way up.
price decrease results in lower total revenue
Increase inelastic
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price elasticity of demand
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%change in quantity demanded/%change in price
QP mayo
QP mayo
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Elastic demand impact on marginal revenue
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MR is positive
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Inelastic demand impact on marginal revenue
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insensitive is a negative thing. MR is negative
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Nonprice factors influencing demand
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Tastes and preferences
Income
Prices of goods related in consumption
Future expectations
Number of potential customers
Income
Prices of goods related in consumption
Future expectations
Number of potential customers
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Nonprice factors influencing supply
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Technology
Input prices (raw materials)
prices of goods related in production (subs and compliments)
future expectations
number of producers
Input prices (raw materials)
prices of goods related in production (subs and compliments)
future expectations
number of producers
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Demand Function
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Substitute goods: positive relationship
Complimentary goods: negative relationship
Beer and pizza are compliments: if the price of pizza goes down, the quantity demanded of beer goes up
Complimentary goods: negative relationship
Beer and pizza are compliments: if the price of pizza goes down, the quantity demanded of beer goes up
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Supply function
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substitute goods: negative
complimentary goods: positive
complimentary goods: positive
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What would not cause the supply curve for gasoline to shift?
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A change in the income of workers
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Levis brand jeans vs blue jeans in general
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Price elasticity of demand is larger for Levis brand than for blue jeans in general
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Expert Opinion
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develop consensus of opinion among experts to analyze consumer behavior
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Direct consumer surveys
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directly asking consumers questions about their response to prices, price changes or price differentials
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Conjoint analysis
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asks consumers to rank and choose among different product attributes, including price to reveal their valuation of these characteristics
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Test marketing
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analyze consumer behavior by analyzing consumer response to products in a real or simulated markets
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Price experiments
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Consumer reaction to different prices is analyzed in a lab situation or a test market environment
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Targeted marketing
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defining different market segments or groups of buyers for particular products based on demographic, psychological and behavioral characteristics of the individuals
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Pitfalls with marketing methods of evaluating consumer demand
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are representing groups truly representative of the larger population? do the answers given represent actual market behavior?
can we isolate the effects of different variables that influence demand?
can we isolate the effects of different variables that influence demand?
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Multiple regression analysis
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estimate the effect of each relevant independent variable on the quantity demanded of a product, while holding constant the effects of all other independent variables. ISOLATE THE IMPACT
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Regression methodology
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Using historical data to make predictions about how variables will affect future demands
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Regression analysis
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an equation that produces a straight line, that best fits the data. Minimizing the sum of the squared deviations of the sample data points
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Cross sectional data
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sample of individuals with different characteristics at a specific point in time. 50 students, hrs studied each, greate of each student's exam
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Time series data
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collected on the same observational unit at a number of points in time
1 student, hours studied on 30 different exams taken
1 student, hours studied on 30 different exams taken
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Panel data
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cross sectional data observed at several points in time. Very hard to analyze
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T test
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used to test the hypothesis that a coefficient is significantly different from zero. T>= 2
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Coefficient of determination (R squared)
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the goodness of fit of the entire estimating equation to the data set
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Q = a - b (P)
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Q= quantity demanded
a= the intercept when P=0
b= the slope of the line, change in Q/change in P
P=price
a= the intercept when P=0
b= the slope of the line, change in Q/change in P
P=price
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Production function
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relationship between flow of inputs and the resulting flow of outputs in a production process
measure of firm's ability to produce. how much firm supplies given how much it invests and how much it works
measure of firm's ability to produce. how much firm supplies given how much it invests and how much it works
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Short run
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at least one input is fixed
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Long run
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a period of time during which all inputs are variable
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Average Productivity
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Total productivity (Q)/Labor
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Marginal Productivity
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Change in TP / Change in L
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Why does total productivity peak then decline?
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Firm should not have too many employees. too many cooks spoil the broth
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Why Marginal productivity peaks where it does?
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WIth each person added, the benefit inreases at in increasing rate (synergy). Eventually the huge benefit of each additional person declines, (benefit still increases, but at a decreasing rate)
CC team expansion, we lost synergy
CC team expansion, we lost synergy
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Law of diminishing marginal returns
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the region of the marginal product curve where the curve is positive, but decreasing. Total product curve is increasing at a decreasing rate. The area on the curve that flattens out
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MP interests AP at the average productivity's peak
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Average productivity still rises, even as MP declines because of additional TP
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Production Cost
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the relationship between the cost of production and the level of output
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Opportunity Cost
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the measure of cost that reflects the use of resources in one activity, in terms of the opportunities forgone in undertaking the next best alternative activity
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Explicit opportunity cost
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Actually cost to society, it is something that is actually paid
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Implicity opportunity cost
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the value of the resource is not actually paid. I gave up a $50,000 job to pursue an MBA program at $40,000. Implicit cost of doing the MBA is $90,000
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Profit
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PriceQuantity-CostQuantity
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Accounting Profit
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Total revenue - explicit total costs
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Economic Profit
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Total revenue-total cost (implicit and explicit costs of production)
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Short run cost function
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at least one fixed input of production
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Fixed Cost
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total cost of the fixed input, regardless of the units of output produced
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Variable Cost
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total cost using the variable input, which increases as more output is produced. Ex: wage per worker or per hour
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Marginal Cost
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How much does it cost to produce one more additional unit of output
Change in total cost Change in quantity
Change in total cost Change in quantity
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Total Cost Curves
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Total Cost on the Y
Quantity on the X
Quantity on the X
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Total Fixed Costs
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Fixed capital (K) * cost of unit production
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Total Variable Cost
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Labor (L) * labor cost per unit
The curve is steep, flat, steep because the change in Quantity demanded is small (the denominator), then large then small. All over a constant increase in cost
The curve is steep, flat, steep because the change in Quantity demanded is small (the denominator), then large then small. All over a constant increase in cost
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Why does average fixed cost curve decline?
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Because total fixed cost is constant as Q increases, which leads to a decline in AFC curve
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Why does AVG decline at first and then evenutally increase?
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Numerator is Total Variable cost which is increasing at a constant rate, while the denominator is increasing at an increasing rate, and then increasing by a decreasing rate
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Why does ATC get to its lowest point after AVC?
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Because AFC is still declining, so it pulls the average total cost down. As the AVC bottoms out, the Q increases at a decreasing rate, making AVC increase a lot and starts to pull ATC up as well
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Marginal Cost
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Change in Total cost/ Change in Quantity demanded= Change in total variable cost/change in quantity demanded
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Marginal cost curve and AVC and ATC curves
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MC always intersects AVC and ATC at their minimums. Once MC is greater than the AVC then it will start to pull up the AVC and ATC curves
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Why are short run production and cost curves inverses of each other?
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If you have high level of production efficiency, then it will lead to low costs
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Long run production function
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All inputs can vary, in the long run nothing needs to be fixed.
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Input substitution
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manager's choice of inputs influenced by: technology of the production process, the prices of the inputs of production, the set of incentives facing the given producer
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Long run average cost function
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minimum average or unit cost of producing any level of output when all inputs are variable
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When K increases
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Labor also increases and quantity demanded increases. You need more people to work more machines, or more people to work in larger factories
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Economies of scale
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Increase k, increase q, SRAC shifts down then goes up. Exists when the firm can achieve lower units costs of production by adopting a larger scale of production
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Diseconomies of Scale
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When the firm incurs higher unit costs of production by adopting a larger scale of production
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Economies of scale up to a specific Q
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Specialization and division of labor (large firms have specialized employees who do one thing and do it very well)
Technological factors (doesn't make sense for a small firm to buy an expensive high-tech machine to produce so many Qs
The use of automation devices (doesn't make sense if you only sell in small batches)
Technological factors (doesn't make sense for a small firm to buy an expensive high-tech machine to produce so many Qs
The use of automation devices (doesn't make sense if you only sell in small batches)
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Reasons for diseconomies of scale
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1. too much specialization
2. local labor and consumer market may be insufficient for large firms
3. physical laws
4. Inefficiencies of managing large-scale operations
2. local labor and consumer market may be insufficient for large firms
3. physical laws
4. Inefficiencies of managing large-scale operations
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minimum efficient scale
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where long-run average cost curve stops declining or at which economies of scale are exhausted
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Perfect competition profit maximization
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Where MR= MC
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cost minimization point
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where MC equals lowest point on ATC
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Why can't other firms enter a monopoly's market?
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Economies of scale, barriers created by government, input barriers, brand loyalties, consumer lock-in and switching costs, network externalities
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Lerner Index
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goods price - marginal cost/price should be > .67. Form in perfect competition has L=0
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cross price elasticity and monopolies
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if a firm doesn't have cross price elasticity, then the firm is a monopoly. No perceived substitutes. A monopolist could have negative cross price elasticity with complimentary goods.
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Concentration Ratios
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closer a firm's sales is 100% of industry's sales, then the closer it is to being a monopoly
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Herfindahl-Hirschman Index
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sum of squares of market share of each firm in the industry. Higher HHI has more market power
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Anti Trust issues
Sherman Act of 1890
Sherman Act of 1890
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Promotes competition. Firms selling similar goods cannot conspire, but must compete. Firms with market power cannot abuse it
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Clayton Act of 1914
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cannot set a price specifically to reduce competition. (walmart setting prices below cost) nike can't tell dicks to not sell under armour. BODs can't sit on competitors boards
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Federal Trade Commission Act of 1914
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Prohibits mergers that would be harmful to consumers. Prohibits unfair competition.
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Monopolistic Competition in the Short Run
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MR=MC
Price > ATC
Price > Marginal Cost
Not at minimum point of ATC curve
Price > ATC
Price > Marginal Cost
Not at minimum point of ATC curve
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Monopolistic Competition Long Run
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P= ATC
P> minimum ATC because demand curve is not flat
Profit maximizing is at MR=MC
P> minimum ATC because demand curve is not flat
Profit maximizing is at MR=MC
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Cannot cost minimize in Monopolistic Competition
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The differentiated product means that because the demand curve is not flat, it's not possible to get Quantity demanded out to the minimum ATC
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Noncooperative Oligopoly model
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assumes the few firms compete with each other, usually benefits consumers but harms the firms. Lowers their profits. Not colluding benefits consumers more
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Cooperative oligopoly model
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Firms explicitly or implicitly cooperate with each other to achieve outcomes that benefit the firms but likely harm consumers
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Kinked demand curve
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Steeper if competitors imitate: it's more like a monopoly
Flatter if other firms don't follow, our firm has no influence on overall market
Flatter if other firms don't follow, our firm has no influence on overall market
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If rivals don't imitate in Oligopoly
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we try charging higher price, we will suffer huge drop in quantity demanded
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Game Theory Model
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study of economics that analyzes situations in which firms make various strategic moves and have different outcomes or payoffs associated with those moves
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Dominant Strategy
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doing what's best for you, no matter other's decision. Best strategy no matter what the other person does. leads to non optimal outcomes
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Nash Equilibrium
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Where you make a decision based on what you think the other will do. No dominant strategy
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Price discrimination
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firm charging different prices to different consumers to maximize profits
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Requirements for successful price discrimniation
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Must be in a monopolistic comp, oligopoly or monopoly: firm that has some power in setting prices
must be able to separate customers into different groups
must be able to prevent resale among the different groups of customers
must be able to separate customers into different groups
must be able to prevent resale among the different groups of customers
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First degree price discrimination
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Firms with market power are able to charge individuals the maximum amount they are willing to pay for each unit of the product
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Second degree price discrimination
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Firms with market power charge different prices for different Blocks of output
price depends on how many units are bought, similar to quantity discount. not as much extra profit as in the first degree.
price depends on how many units are bought, similar to quantity discount. not as much extra profit as in the first degree.
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Third degree price discrimination
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Most common. Different cities have different demand functions. Cost of production is the same across all locations, the demand function differs across US, so you charge different price for each location's profit maximizing point.
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Versioning
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Offering slightly different versions of what is essentially the same thing to take advantage of people's willingness to pay more (gap vs. banana republic)
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Bundling
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Makes more money for the firm than if items were to be sold separately
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Promotional Pricing
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sales prices are correct profit-maximizing prices. Firms know that rich lazy people are willing to pay more for less work .You would have to clip the coupon to get the promotional price