Chapter 2: Income - Detailed Notes
Income, Wealth, and Assets
Income is a flow of money received over a period of time (e.g., salary, rent, interest, benefits). It represents the earnings generated from labor, capital, or other resources. Wealth (or assets) is a stock of resources at a given point in time (e.g., house, car, investments). It encompasses the total value of accumulated possessions.
Assets can be:
Financial (savings accounts, stocks, bonds, pensions).
These are liquid and represent claims on future income.
Physical (real estate, art, jewelry, vehicles).
These provide utility or can be sold for value.
Intangible (intellectual property, brand recognition, pension rights, insurance policies, human capital).
These lack physical substance but have economic value.
Human capital is the value of skills, experience, and education. It is enhanced through investments in education and training, leading to increased productivity and earnings.
Liquidity refers to how easily an asset can be converted to cash without significant loss of value. Liquid assets (cash, checking accounts) are easily converted, while illiquid assets (real estate, collectibles) are not.
Sources of Income
For working-age individuals, the primary income source is paid employment (salary or self-employment). Salary refers to fixed compensation, while self-employment involves earning income from one's own business.
In developing countries, self-employment is a larger income share due to limited formal employment opportunities. State cash transfers (social welfare programs) are also limited due to fiscal constraints.
Gross household income is the total income before taxes and deductions. It includes all earnings from various sources within a household.
Informal employment (unregistered work) is more common in developing countries due to lack of regulatory enforcement and social safety nets.
Distribution of Income
Income sources vary by income level. Lower-income households rely on state cash transfers and wage income, while higher-income households rely on investments, business profits, and self-employment.
Social scientists assess income differences using:
Mean income: The average income, calculated by summing all incomes and dividing by the number of people.
Median income: The middle income when incomes are arranged in order. Half of the people earn less, and half earn more than the median. The median is less sensitive to extreme values than the mean.
Percentiles: Values dividing the income distribution into 100 equal parts. For example, the 10th percentile is the income level below which 10% of the population falls.
Income inequality can detrimentally affect social cohesion, trust, population health, and well-being. High inequality can lead to social unrest and reduced economic mobility.
Income, Living Standards, and Inflation
Income impacts living standards and quality of life. It reflects the monetary part of someone’s quality of life, but well-being also depends on health, education, social relationships, and environmental factors. Subjective well-being measures, such as life satisfaction scores, capture these broader dimensions.
Inflation is the general increase in prices, reducing purchasing power. It erodes the real value of income and savings.
Consumer Price Index (CPI) tracks the value of a basket of goods and services purchased by a typical household.
Nominal value is the monetary value at a given time, without adjusting for inflation, while real value is adjusted for inflation, providing a measure of purchasing power.
Real incomes measure changes in living standards, reflecting the actual amount of goods and services that can be purchased.
Disposable income is income after direct taxes (e.g., income tax) but before accounting for indirect taxes (e.g. VAT). Equivalized household income adjusts for household size, reflecting economies of scale in consumption.
Inequality has increased in many developed countries, with income gains concentrated at the top, leading to debates about fairness and policy interventions.
Wages and Employment
The labor market is where employers and employees negotiate working conditions and pay. It is influenced by supply and demand factors, institutional settings, and government policies. Classical economics states that employers maximize profits, and employees maximize earnings.
Workers value pay, job security, opportunities for advancement, and interesting work. These factors influence job satisfaction and productivity.
Deregulation and privatization have weakened trade unions, reducing their bargaining power and potentially contributing to wage inequalities.
Technological innovation has transformed manufacturing and automated many medium-skilled jobs, leading to job displacement and the need for workforce retraining.
Female employment has increased significantly due to greater access to education, changing social norms, and shifts to service-based industries. However, gender pay gaps persist.
How Much are People Paid?
Wages are determined by personal characteristics (skills, qualifications, experience), job characteristics (requirements, demand), and the work environment (industry, location).
Educational attainment typically increases pay because of transferable skills, but the field of qualification also matters. STEM fields (Science, Technology, Engineering, and Mathematics) often command higher wages.
Experience generally leads to higher pay, especially if skills are specific to a job. On-the-job training and skill accumulation contribute to wage growth.
Career breaks can reduce experience and skill levels, leading to potential wage penalties upon re-entry into the workforce.
Job characteristics influence wage levels, with higher demand for skills leading to higher rewards. Riskier or more unpleasant jobs may also command higher wages.
Sector competitiveness affects wages through bargaining power and competition. Highly competitive industries may offer higher wages to attract talent.
Migration can fill skill gaps and boost economies, but it can also create wage pressures in certain sectors.
Collective bargaining (via trade unions) and legislation (minimum wage, basic rights) provide a framework for wage negotiations and protect workers' rights.
Highly qualified occupations are better paid than less qualified ones due to greater demand and higher productivity.
Gender pay gaps exist due to part-time employment, occupational segregation, and gender social norms that influence career choices and opportunities.
Income Profiles and the Life Course
Understanding income changes over a lifetime is essential for financial planning, retirement savings, and social security policy.
Income profiles vary, but typical patterns exist, influenced by education, occupation, gender, and economic conditions.
Lower-skilled workers' earnings peak early, while highly educated professional earnings peak later due to longer training periods and career development.
Women's earnings often peak earlier due to family responsibilities and potential career interruptions. Policies supporting work-life balance can mitigate this.
Household income profiles may be bumpier due to self-employment, temporary contracts, or economic shocks. Diversification of income sources can provide stability.
Income Tax and Social Protection
Taxation funds public services (healthcare, education, infrastructure) and reduces inequality through redistributive policies. Original income is income before government intervention. Gross income includes cash benefits, while disposable income is income after taxes.
Personal income tax (levied on individual earnings) and social security contributions (financing social insurance programs) make up a significant part of tax revenue.
Most income tax systems feature:
Taxable income: The portion of income subject to taxation after deductions and exemptions.
Deductions: Allowable expenses that reduce taxable income (e.g., mortgage interest, charitable donations).
Unit of assessment: Whether taxation is based on individual or household income.
Levy method: How taxes are collected (e.g., withholding from wages, self-assessment).
Tax schedule: The tax rates applied to different income brackets.
Individual taxation is common, with progressive tax systems taxing higher incomes more heavily, aiming to redistribute wealth.
Progressive tax systems use tax brackets and potentially a personal allowance (PA), which is a portion of income that is not taxed, providing a base level of tax-free income.
Marginal tax rate is the rate at which the last unit of income is taxed, influencing incentives to earn additional income.
Tax deductions can incentivize certain behaviors (e.g., pension contributions, charitable donations), promoting social goals.
Social security benefits provide income replacement (unemployment, sickness, retirement) or cover additional needs (children, disability), providing a safety net.
Benefits can be universal (available to all), contributory (based on contributions), or means-tested (based on income and assets).
Means-tested benefits aim to target support to those most in need, but can cause disincentives to work:
Unemployment trap: benefits are better than low-paying work, discouraging job search.
Poverty trap: benefits and work do not lift the recipient above the poverty line, reducing incentives to increase earnings.
Opportunity cost is the value of what is forgone when making a choice. It represents the potential benefits missed when choosing