Notes on Economic Welfare and Income Distribution

Economic Welfare: Consumer and Producer Surplus

Foundational Concepts of Market Welfare: * Economic welfare is assessed based on the gains that both consumers and producers derive from market activities. * Marginal Benefit ( $MB$ ): Defined as the additional satisfaction, expressed in monetary terms ( $ ), that a consumer receives from consuming one specific unit of a product. * Total Benefit ( $TB$ ): The cumulative satisfaction, expressed in dollar terms, obtained from consuming a specific amount of a product.
Consumer Surplus ( $CS$ ): * Definition: The difference between the maximum amount consumers are willing to pay for a product and the market price they actually pay. * Net Benefit: It represents the net gain in dollar terms from purchasing a product at its current market price. * Calculations: * Individual Consumer Surplus = Total Benefit ( $TB$ ) − Total Expenditure ( $TE$ ). * Excess Benefit: The total cumulative difference between marginal benefits and marginal costs for all units produced and consumed. * Visual Representation (Figure 7.1 & 7.2): * In a pizza market example, if a consumer pays $10$ for $3$ pizzas but gains $14$ in benefit from the first and $12$ from the second, the surplus is found in area $A$ , while total expenditure is area $B$ . * Market-wide: If the price is $10$ and quantity is $100,000$ pizzas, Total Benefit is area $A + B$ and Consumer Surplus is area $A$ ( $400,000$ ), where Expenditure (Area $B$ ) is $1,000,000$ .
Producer Surplus ( $PS$ ): * Definition: The difference between the actual price producers receive for a product and the minimum price they were willing to accept to sell it. * Calculation: It is the difference between the revenue received from each unit and the marginal cost ( $MC$ ) of producing that unit. * Visual Representation (Figure 7.3): Shown as the area above the supply curve and below the market price (Area C = $400,000 in the pizza market example).

Market Efficiency and Perfect Competition

Optimal Allocation: * In a perfectly competitive market, the principle of marginal-cost pricing ensures equilibrium where Marginal Benefit ( $MB$ ) equals Marginal Cost ( $MC$ ). * At this equilibrium, both consumer surplus and producer surplus are maximized, leading to the highest possible economic welfare.
Conditions for Welfare: * If Quantity ( $Q$ ) < $100,000$ units: $MB > MC$ , implying more should be produced to increase welfare. * If Quantity ( $Q$ ) > $100,000$ units: MC > MB, implying a reduction in output would improve economic efficiency.
The Uncompetitive Market (Figure 7.5): * Markets may become uncompetitive due to collusion or government policy, leading to restricted output (e.g., from $100,000$ to $75,000$ pizzas) and higher prices (from $10$ to $12$ ). * Transfer of Wealth (Area $E$ ): A portion of what was consumer surplus is transferred to producers as higher profits. * Deadweight Loss (Area $F + G$ ): A net reduction in total economic welfare (both consumer and producer surplus lost) due to the inefficiently low output level.

Spillover Effects and Market Failure

Definitions: * Spillover Effects (Externalities): External consequences of economic activity that impact third parties not directly involved in the production or consumption of the product. * Market Failure: Occurs when market prices do not reflect all social costs or benefits, leading to inefficient resource allocation.
Spillover Costs (Negative Externalities): * These occur when production or consumption imposes costs on others (e.g., pollution, second-hand smoke). * Impact: Producers only consider private costs. Consequently, the price is too low and output is too high compared to the socially optimal level. * Mechanism (Figure 7.6): The social supply curve ( $S_1$ ) is vertically higher than the private supply curve ( $S_0$ ). The vertical distance represents the spillover cost. * Government Intervention: Implementing an excise tax (e.g., $1.00/ ext{litre}$ on gasoline) can shift the supply curve from $S_0$ to $S_1$ , moving equilibrium from point $b$ to point $a$ to reflect internal and external costs. * Examples: BP Oil Spill (2010), Pacific Gas & Electric (Erin Brockovich case), environmental pollution, and proposed taxes on junk foods to combat obesity.
Spillover Benefits (Positive Externalities): * These occur when economic activity benefits third parties (e.g., education, vaccinations). * Impact: Private demand is lower than social demand. Consequently, the market produces too little of the good. * Mechanism (Figure 7.7): The social demand curve ( $D_1$ ) is higher than the private demand curve ( $D_0$ ). * Government Intervention: Subsidies provided to consumers or producers. For example, a $2,000$ subsidy for engineering students shifts demand from $D_0$ to $D_1$ , increasing enrollment to the socially optimal level (point $b$ ).

Public Goods and Private Solutions

Public Goods: * Characteristics: Defined by shared consumption (non-rivalry) and non-exclusion (it is impossible or too costly to prevent non-payers from consuming). * Examples: National defense, street lights, lighthouses, dams, weather forecasts, and the court system. * Private Sector Failure: Because of the "free-rider" problem, the private sector lacks incentive to produce these goods in sufficient quantities.
Quasi-Public Goods: * Goods that have shared consumption but where exclusion is possible. * Examples: Toll roads, public education (with attendance policies).
The Coase Theorem: * The idea that private parties can solve the problem of externalities on their own through negotiation, provided property rights are well-defined and transaction costs are low. * Dismal Lake Scenario: * Scenario A: The Smiths are the only family. No externality exists because they bear all costs of their own pollution. * Scenario B: Whiplash pollutes and the Smiths suffer. Private solutions include fines, the Smiths cleaning it themselves, or the Smiths paying Whiplash to stop. * Scenario C: Multiple families. Private solutions become difficult due to high monitoring costs and identification issues, necessitating government regulation.
Tragedy of the Commons: A situation where individuals acting in their own self-interest deplete a shared resource (like a public pasture or fishery), even though it is not in anyone's long-term interest.

Excise Taxes and Elasticity

Excise Tax Types: * Ad Valorem: Tax based on a fixed percentage of the product's price. * Specific: Tax based on a fixed dollar amount per unit of quantity.
Tax Incidence (Who pays the tax?): * Elasticity Rule for Demand (Figure 7.9): * If demand is Elastic: Producers pay a larger share of the tax because consumers are sensitive to price changes. (Example: Consumers pay $0.25$ , Producers pay $0.75$ of a $1.00$ tax). * If demand is Inelastic: Consumers pay a larger share of the tax because they will continue to buy the product despite price increases. * Elasticity Rule for Supply (Figure 7.10): * If supply is Elastic: Consumers pay a larger share of the tax. * If supply is Inelastic: Producers pay a larger share of the tax.
Tax Calculation: * The after-tax price for consumers is the intersection of the new supply curve ( $S_1$ ) and the demand curve. * The after-tax price for producers is the corresponding price on the original supply curve ( $S_0$ ) at the new equilibrium quantity.

Government Price Controls

Price Floors (Minimum Prices): * Definition: A legal minimum price set above the market equilibrium. * Result: A market surplus (Quantity Supplied > Quantity Demanded). * Example: Agricultural Price Supports (Figure 7.11): If the equilibrium price for milk is $1.50$ but the government sets a floor at $2.00$ , a surplus of $30 ext{ million litres}$ is created. Consumers pay more, while farmers benefit from higher prices.
Price Ceilings (Maximum Prices): * Definition: A legal maximum price set below the market equilibrium. * Result: A market shortage (Quantity Demanded > Quantity Supplied). * Example: Rent Controls (Figure 7.12): If the equilibrium rent is $1,000$ but a ceiling is set at $750$ , a shortage of $10,000 ext{ units}$ occurs. Benefits some tenants (middle-class) while harming others (poor who can't find units) and landlords.

Income Distribution in Canada

The Lorenz Curve (Figure 7.14): * A graphical representation of income distribution showing the cumulative share of income earned by cumulative percentages of households. * Line of Perfect Equality: A $45^{∘}$ line where every household earns the same income. * Line of Perfect Inequality: A line following the axes where one household earns all the income. * Canada's Data (2011/2008): * Lowest $20%$ of households: Received $4%$ of total income. * Highest $20%$ of households: Received $47%$ of total income.
The Gini Coefficient: * A numerical measure of the Lorenz curve. * Ratio = (Area between line of equality and Lorenz curve) / (Total area under line of equality). * Range from $0$ (perfect equality) to $1$ (perfect inequality).
Income Inequality Data (Figure 7.13): * 1961: Lowest quinitle ( $4%$ ), Highest quintile ( $44%$ ). * 2011: Lowest quintile ( $4%$ ), Highest quintile ( $47%$ ). * Average Income (2011) for Highest $20%$ was $176,900$ , compared to $15,500$ for the Lowest $20%$ .

Earnings and Wage Determinants

Seven Main Wage Determinants: 1. Labour Productivity: Output per worker per unit of time; considered the most important determinant. 2. Education: Investment in human capital. Higher education usually results in higher pay (Figure 7.16 shows Management occupations with University degrees earning nearly $100,000$ while those with some high school earn approximately $40,000$ ). 3. Experience: On-the-job training increases productivity. Seniority rights provide privileges like first-choice promotions and overtime. 4. Job Conditions: Difficult or dangerous work requires higher wages to attract talent. 5. Regional Disparities: Wage differences based on local economy health and labour immobility. 6. Market Power: Unions and professional associations. 7. Discrimination: Hiring or wage decisions based on criteria other than performance (Direct vs. Indirect).
Labour Unions: * Industrial Unions: Include all workers in a specific industry regardless of skill level. * Craft Unions: Include workers in specific occupations and restrict membership.

Poverty and the Welfare Society

Measuring Poverty in Canada: * Low-Income Cut-Off (LICO): Defined by households spending more than $64%$ of after-tax income on food, clothing, and shelter. Varies by community size (e.g., a family of $4$ in a city over $500,000$ people had a cut-off of $31,865$ in $2004$ ). * Market Basket Measure (MBM): An absolute definition based on the cost of a specific basket of necessary goods and services. * Incidence of Poverty (2004 Data): Approximately $3.5 ext{ million}$ Canadians, including $870,000$ children. Poverty rates are significantly higher for unattached females ( $30.5%$ ) and single-parent families ( $40%$ ).
Transfer Payments: * Universality: Benefits provided to all regardless of income (expensive but treats all equally). * Means Testing: Benefits vary based on income (targets the poor but may limit total spending). * The poorest $20%$ of households receive transfer payments equaling $54.5%$ of their total income.
Principles of Taxation: * Benefits Received: Taxes geared to the benefits gained (e.g., gas taxes for roads). * Ability to Pay: Taxes based on financial capacity (e.g., personal income tax).
Tax Categories: * Progressive: Proportion of income paid increases as income rises (e.g., Personal Income Tax). * Proportional: Constant proportion of income regardless of earnings level. * Regressive: Proportion of income paid decreases as income rises (e.g., Sales and property taxes). * Canadian Income Tax Rates (2018 Federal): * $15%$ on the first $46,605$ * $20.5%$ on the next $46,603$ * $26%$ on the next $51,281$ * $29%$ on the next $61,353$ * $33%$ on income over $205,842$

Historical Figures and Economic Choices

Thomas Malthus (The Doomsday Prophet): * Theorized that food supply increases in an algebraic progression ( $1, 2, 3…$ ) while human population increases in a geometric progression ( $1, 2, 4, 8…$ ). * Predicted future population growth would inevitably outstrip the food supply, leading to mass disaster.
Human Capital Case Study: * Three friends with different paths: workforce directly, English literature major, and computer science major. * The worker chooses immediate purchasing power over future gains. * The English major views education as a consumption item (pleasure/knowledge). * The Computer Science major views education as an investment in human capital to increase future earning power.