Economics Flashcards
Own Price Elasticity
Measure of the responsiveness of the quantity demanded to change in a price. Negative if an increase in price decreases quantity demanded
Elastic
When quantity demanded is very responsive to a change in price (absolute value of elasticity > 1)
Inelastic
When quantity demanded is not very responsive to change in price (absolute value of elasticity < 1)
Perfectly Elastic
At any higher price, quantity demanded decreases to zero. Elasticity = infinity (horizontal line). When one or more goods are very good substitutes
Perfectly Inelastic
A change in price has no effect on quantity demanded. Elasticity = 0 (vertical line). Few or no good substitutes for a good
Portion of Income
The larger the proportion of income spent on a good, the more elastic an individual’s demand for that good
Time
Elasticity of demand tends to be greater the longer the time period since the price change
Inelastic Range
Lower part of the demand curve, where percentage change in quantity demanded is smaller than the percentage change in price. Total revenue will increase when price increases (percentage decrease in quantity demanded will be less than the percentage increase in price)
Elastic Range
Upper part of the demand curve, where percentage change in quantity demanded is greater than the percentage change in price. Total revenue will decrease when price increases (percentage decrease in quantity demanded will be greater than the percentage increase in price)
Unitary Elasticity
A 1% increase in price leads to a 1% decrease in quantity demanded (-1 elasticity). Point of greatest total revenue. Price increase moves into elastic region, price decrease moves into inelastic region
Income Elasticity
The sensitivity of quantity demanded to a change in income. Ratio of the percentage change in quantity demanded to the percentage change in income
Normal Goods
The sign of income elasticity is positive (an increase in income leads to an increase in quantity of goods demanded) –> positive income effect
Inferior Goods
Sign of income elasticity is negative (an increase in income leads to a decrease in quantity demanded) –> negative income effect
Cross Price Elasticity
The ratio of the percentage change in the quantity demanded of a good to the percentage change in the price of a related good
Substitutes
When an increase in the price of a related good increases the demand for a good (an increase in the price of one will lead consumers to purchase more of the other) –> cross price elasticity is positive (price of one is up, quantity of the other is up)
Complements
When an increase in price of a related good decreases demand for a good (an increase in the price of one leads consumers to purchase less of the other as well) –> cross price elasticity is negative
Substitution Effect
Always acts to increase the consumption of a good that has fallen in price
Income Effect
Can either increase or decrease consumption of a good that has fallen in price (total expenditure on the original bundle of goods falls as result of substitution effect)
Giffen Good
Inferior good for which the negative income effect outweighs the positive substitution effect when price falls (demand rises when price rises, and demand falls when price falls) –> bread, rice, wheat (few substitutes, substantial portion of buyer’s income)
Veblen Good
A higher price makes the good more desirable. Consumer gets utility from being seen to consume a good that has high status (luxury goods). This is not an inferior good. Both substitution and income effects of price increase decrease consumption
Factors of Production
Resources a firm uses to generate output
Land: where facilities are located
Labor: all workers (unskilled to management)
Capital: manufacturing facilities, equipment, machinery
Materials: raw materials and manufactured inputs
Production Function
Quantity of output that a firm can produce as a function of the amounts of capital and labor employed
Diminishing Marginal Productivity
The quantity of labor for which the additional output for each additional worker begins to decline (diminishing marginal returns)
Short Run
The time period over which some factors of production are fixed (capital) –> If total revenue is greater than total variable cost, and price is greater than average variable costs, firm can stay open in the short run. If average revenue is less than average variable costs, shut down
Long Run
All factors of production are variable (leases can expire, sell equipment) –> firm can avoid short run fixed costs by shutting down. If price is below average minimum total cost, shut down
Perfect Competition
Many firms produce identical products, and competition forces them all to sell at the market price. price = marginal revenue = average revenue (price taker). Perfectly elastic demand curves
Barriers to Entry: very low
Substitutes: very good
Nature of Competition: price only
Pricing Power: none (supply and demand determine)
Short Run Shutdown Point
If average revenue is less than average variable cost in the short run, shut down. If average revenue is greater than average variable cost, can still operate even with losses
Long Run Shutdown Point
Firm should shut down if average revenue is less than average total cost
Breakeven Point
Average revenue is equal to average total cost (total revenue = total cost)
Price Searcher Firms
Downward sloping demand curve, marginal revenue does not equal price (imperfect competition)
Long Run Average Total Cost Curve
Drawn for many different plant sizes or scales of operation. Each point along the curve represents minimum ATC for a given plant size or scale of operations
Minimum Efficient Scale
Average total costs first decrease (economies of scale) with larger scale and eventually increase (diseconomies of scale). Lowest point is scale or plant size where average total cost of production is at a minimum
Monopoly
Only one firm is producing a product with no close substitutes. Chooses the price at which it sells. Patents, copyrights, control resources (supported by the government) Barriers to Entry: very high Substitutes: none Nature of Competition: advertising Pricing Power: significant
Monopolistic Competition
Many independent sellers and differentiated products (products not identical). Downward sloping demand curve.
Barriers to Entry: low
Substitutes: good but differentiated
Nature of Competition: price, marketing, quality
Pricing Power: some (each firm has relatively small market share, no one can control the price). Too many firms for collusion –> price searchers
Maximize Profit: MR = MC (that’s where you find Q and also P on demand curve)
Oligopoly
Few firms that compete in a variety of ways (interdependent). Very large firms respond to actions of the others
Barriers to Entry: high
Substitutes: very good or differentiated
Nature of Competition: price, marketing features, quality
Pricing Power: some to significant
Natural Monopoly
Single firm supplies entire market demand for product. The average cost of production is falling over the relevant range of consumer demand. Having two or more producers would result in significantly higher cost of production and be detrimental to consumers
Network Effects
Synergies. Make it very difficult to compete with a company once it has reached a critical level of market penetration (has a moat). Changes in technology and consumer taste threaten
Marginal Revenue
Increase in total revenue from selling one more unit of a good or service. Maximize profit by selling quantity for which MR = marginal cost
Shutdown Point
If the firm is only just covering its variable costs (P = AVC)
Long Run Equilibrium Output
MR = MC = ATC for perfectly competitive firms (where ATC is minimized)
Short Run Supply Curve
MC line above the AVC curve
Short Run Market Supply Curve
Horizontal sum (add up quantities of all firms at each price) of the MC curves for all firms in a given industry (upward sloping to the right)
Markup
In monopolistic competition, P > MC (price slightly higher than perfect competition)
Excess Capacity
ATC is not at a minimum for quantity produced, suggesting inefficient scale of production
Product Innovation
Firms that bring new and innovative products to the market are confronted with less-elastic demand curves, enabling them to increase price. Optimal amount of innovation is when MC addtl. innov = MR addtl. innov
Kinked Demand Curve
An increase in a firm’s product price will not be followed by its competitors, but a decrease in price will (more elastic, flatter, above a given price than below). Gap in MR curve (MC passes through)
Cournot Model
Model considers a duopoly, where both firms have identical and constant marginal costs of production. Each firm knows the quantity supplied by the other firm in the previous period and assumes that this is what it will supply in the next period. Subtract Q from linear market demand curve to construct own demand and MR curve to determine profit maximizing Q. Quantities will change each period until they are equal
Nash Equilibrium
Reached when the choices of all firms are such that there is no other choice that makes any firm better off (increases profits or decreases losses)
Prisoner’s Dilemma
Prisoner A confesses, B remains silent: A freed, B 10 yrs
Prisoner B confesses, A remains silent: B freed, A 10 yrs
Both silent: 6 months each
Both confess: 2 years each
Equilibrium is that both confess
Collusion
Nash equilibrium is to undercut the agreement to have two firms raise prices (going lower). Collusive agreements more successful when there are fewer firms, products more similar, cost structures more similar, purchases small and frequent, retaliation for cheating certain and severe, less competition from outside firms to the cartel
Dominant Firm Model
Single firm that has a significantly large market share because of its greater scale and lower cost structure. Market price determined by this firm, other firms take this price as a given
Price Discrimination
If a monopoly’s customers cannot resell the product to each other for a lower price, maximize profits by charging different prices to different customers for same product or service
Deadweight Loss
Quantity produced by a monopolist reduces the sum of consumer and producer surplus by an amount represented by empty triangles under demand curve. Monopoly is inefficient compared to perfect competition because of this reduction, but price discrimination reduces this inefficiency
Rent Seeking
When producers spend time and resources to try to establish a monopoly
Average Cost Pricing
Forces monopolist to reduce price to where ATC intersects the market demand curve. Increases output and decreases price, increases social welfare, normal profit (price = ATC)
Marginal Cost Pricing
Forces monopolist to reduce price to the point where firm’s MC curve intersects the market demand curve. Increases output and reduces price, but causes monopolist to incur a loss because price is below ATC (requires a government subsidy)
N-firm Concentration Ratio
The sum or the percentage market shares of the largest N firms in a market (relatively insensitive to mergers of two firms with large market shares)
Herfindahl-Hirschman Index (HHI)
Sum of the squares of of the market shares of the largest firms in the market
GDP
Total market value of the goods and services produced in a country within a certain time period (size of the nation’s economy). Includes only purchases of newly produced goods and services
Final Goods
Goods and services that will not be resold or used in the production of other goods and services (input goods’ value included in final prices)
Expenditure Approach
GDP calculated by summing the amounts spent on goods and services produced during the period --> value of final output method -Consumption -Investment -Government Spending -Exports/Imports (Net Exports) C + I + G + (X - M)
Income Approach
GDP calculated by summing the amounts earned by households and companies during the period (wage income, interest income, business profits) –> sum of value added method
National Income + Capital Consumption Allowance + Statistical Discrepancy
Nominal GDP
GDP as described under the expenditures approach (inflation will increase nominal GDP)
Real GDP
Measures the output of the economy using the prices from a base year, removing the effect of changes in prices so that inflation is not counted as economic growth
GDP Deflator
Price index that can be used to convert nominal GDP into real GDP, taking out the effects of changes in the overall price level. Based on the current mix of goods and services, using prices at the beginning and end of the period
Per Capita Real GDP
Real GDP divided by population (measure of economic well-being of a country’s residents)
Capital Consumption Allowance
Measures the depreciation of physical capital from the production of goods and services over a period. The amount that would have to be reinvested to maintain the productivity of physical capital from one period to the next
Statistical Discrepancy
Adjustment for the difference between GDP measured under the income approach and the expenditure approach
National Income
Sum of the income received by all factors of production that go into the creation of final output
+Compensation of employees (wages and benefits)
+Corp and govt. profits before taxes
+Interest Income
+Unincorporated business net income
+Rent
+Indirect business taxes - subsidies
Personal Income
Measure of the pretax income received by households and is one determinant of consumer purchasing power and consumption (includes all income that households receive) \+National Income \+Transfer Payments to households -Indirect Business Taxes -Corporate Income Taxes -Undistributed Corporate Profits
Personal Disposable Income
Personal income after taxes. Measures the amount that households have available to either save or spend on goods and services
Total Income
+Consumption Spending
+Household and Business Savings
+Net Taxes (Taxes - Transfer payments received)
Fiscal Balance
Difference between government spending and tax receipts (G - T)
- Negative value is budget surplus, positive value is budget deficit
- Government deficit is financed by trade deficit or excess of private saving over private investments
Trade Balance
Net exports (X -M) -Positive value is trade surplus, negative value is trade deficit
Consumption
Function of disposable income. Increase in personal income or decrease in taxes increase consumption and saving
- Marginal Propensity to Consume: portion of additional income spent on consumption
- Marginal Propensity to Save: proportion saved (MPC + MPS = 100%)
Investment
Function of expected profitability and the cost of financing (depends on the overall level of economic output)
Government Purchases
Tax revenue to the government, therefore fiscal balance
Net Exports
Function of domestic disposable incomes (imports), foreign disposable incomes (exports), relative prices of goods in foreign and domestic markets
IS Curve
Income-savings. Negative relationship between real interest rates and real income for equilibrium in the goods market. Points on the curve are combinations of real interest rates and income consistent with equilibrium in goods market
LM Curve
Liquidity-money. Positive relationship between real interest rates and income consistent with equilibrium in the money market (increase in money supply shifts curve downward)
Real Money Supply
M/P constant. Increase in real interest rates must be accompanied by an increase in income for equilibrium.
- M is nominal money supply
- P is price level
Aggregate Demand Curve
Relationship between the quantity of real output demanded (real income) and price level. Slopes down because higher price levels reduce wealth, increase real rates, and make domestic goods more expensive
Aggregate Supply Curve
Relationship between price level and the quantity of real GDP supplied when all other factors are kept constant (amount of output firms will produce at different price levels)
Very Short Run Aggregate Supply Curve (VSRAS)
Firms will adjust output without changing price by adjusting labor hours and intensity of use of plant and equipment (perfectly elastic curve)
Short Run Aggregate Supply Curve (SRAS)
Slopes upward because some input prices will change as production is increased or decreased. Output prices will change proportionally to price level, some input prices are sticky. Total level of output willing to supply at different price levels
Long Run Aggregate Supply Curve (LRAS)
All input costs can vary. Wages and other inputs change proportionally to the price level, so price level has no long run effect on aggregate supply (Potential GDP or Full Employment GDP) –> perfectly inelastic
Increase in Agg Demand
Increase in aggregate demand (quantity of goods and services demanded is greater at any given price level)
- Increase in Consumer Wealth (C increases)
- Business Expectations (I increases)
- Consumer expectations of future income (C increases)
- High capacity utilization (I increases)
- Expansionary monetary policy (C and I increase)
- Expansionary fiscal policy (C and G could increase with tax cut or spending increase)
- Exchange Rates (net X increases)
Shifts in Short Run Agg Supply Curve
Quantity supplied at each price level increases.
- Labor Productivity: output per hour worked (decreases unit costs to producers, increases output)
- Input Prices: decrease in wages or prices of other inputs increases production
- Expectations of future output prices
- Taxes and govt. subsidies: decrease in taxes, increase subsidies decrease cost of production and increase output
- Exchange Rates: appreciation in currency decreases cost of imports (reduces production costs for inputs)
Shifts in Long Run Agg Supply Curve
Affect the real output that an economy can produce at full employment.
- Increase in supply and quality of labor
- Increase in supply of natural resources
- Increase in stock of physical capital
- Technology
Recessionary Gap
Decrease in aggregate demand results in lower real output and lower price level. Real GDP is less than full employment potential (period of declining GDP and risking unemployment)
Fiscal Policy
Increasing (expansionary) government spending or decreasing taxes –> stabilize aggregate demand
Monetary Policy
Central bank’s actions that affect the quantity of money and credit in an economy in order to influence economic activity
Inflationary Gap
Increase in aggregate demand from its previous level causes upward pressure on the price level. Competition among producers for workers, raw materials and energy shifts curve back to full-employment GDP (higher price)
Stagflation
Declining economic output and higher prices (stagnant economy with inflation) –> decrease in SRAS (shift left) caused by increase in prices of input (lower GDP, higher price). Subsequent decrease in input prices will increase demand returns to full employment at higher price
AD and AS Increase Same Time
Real GDP increases, but price level depends on magnitude of changes (price effects in opposite directions)
AD and AS Decrease Same Time
Real GDP decreases, effect on price level depends on magnitude of changes (price moves in opposite directions)
AD Increases, AS Decreases Same Time
Price level increases, effect on real GDP depends on relative magnitudes
AD Decreases, AS Increases Same Time
Price level decreases, effect on real GDP depends on relative magnitudes
Economic Growth
Labor supply, human capital, physical capital stock, technology, natural resources
Labor Supply
Number of people over the age of 16 who are either working or available for work but currently unemployed. Affected by population growth, net immigration
Human Capital
Education and skill level of a country’s labor force
Physical Capital Stock
High rate of investment (increases labor productivity and potential GDP)
Technology
Improvements in technology increase productivity and potential GDP
Natural Resources
Raw materials. May be renewable (forests) or non-renewable (coal). Countries with large amounts can achieve greater rates of economic growth
Sustainable Rate of Economic Growth
Growth in potential GDP (growth in labor force and growth in labor productivity). Rate of increase in economy’s productive capacity
Production Function
Describes the relationship of output to the size of the labor force, capital stock and productivity. Function of the amounts of labor and capital that are available and their productivity, which depends on level of technology
Total Factor Productivity
Quantifies the amount of output growth that is not explained by increases in the size of labor force and capital (inferred)
Capital Deepening Investment
Increasing physical capital per worker over time (will not sustain long term growth)
Solow (Neoclassical) Model
Contributions of capital, labor and technology to economic growth
Business Cycle
Fluctuations in economic activity. Real GDP and rate of unemployment are variables (do not occur at regular intervals)
Expansion
Real GDP increases. Growth in most sectors, increasing employment, consumer spending and business spending. Two consecutive quarters of real GDP growth
Peak
Real GDP stops increasing, starts decreasing. Rates of increase in spending, investment and employment slow but remain positive, while inflation accelerates (before decrease)
Contraction/Recession
Real GDP decreases. Declines in most sectors, inflation decreasing. Two consecutive quarters of declining real GDP
Trough
Real GDP stops decreasing, starts increasing. The economy then begins a new expansion (recovery), and economic growth becomes positive again, inflation is moderate, employment growth doesn’t increase until later
Inventory-Sales Ratio
When an expansion is reaching its peak, sales growth begins to slow and unsold inventories accumulate. This ratio will increase. When reaching its trough, inventories will become depleted more quickly and sales growth accelerates (ratio decreases)
Mortgage Rates
Low interest rates increase home buying and construction, high rates reduce
Housing Costs Relative to Income
When incomes are cyclically high relative to home costs (mortgage financing costs), home buying and construction tend to increase. When home prices are rising faster than incomes, housing activity can decrease (late cycle)
Speculative Activity
Rising home prices can lead purchases based on expectations of further gains. Higher prices lead to more construction and excess building, resulting in falling prices and decreased housing activity
Demographic Factors
Proportion of population in 25 - 40 segment is positively related to activity in the housing sector
Neoclassical School
Shifts in both aggregate demand and aggregate supply are primarily driven by changes in technology over time. Economy has a strong tendency toward full employment equilibrium. Business cycles result from temporary deviations from long run equilibrium
Keynesian School
Shifts in aggregate demand due to changes in expectations primary cause of business cycles. Fluctuations due to swings in the level of optimism of those who run businesses (overinvest and overproduce when too optimistic). Wages are downward sticky (decrease in wages unable to increase short-run aggregate supply and move from recession back to full employment). Increase aggregate demand through monetary policy or fiscal policy
New Keynesian School
Prices of productive inputs rather than labor are also downward sticky