Exhaustive Notes on Environmental Economics and Demography

THE ENVIRONMENT AS A COMPOSITE ASSET AND THE AYRES-KNEESE MODEL

• Fundamental Nature of the Environment: The environment is considered a scarce resource with conflicting alternative usages. Economic agents often overexploit it because market prices frequently fail to capture the full social cost and social benefit of its use.

• Constituent Parts: It includes all biological life forms, energy systems, material resources, the stratosphere (high atmosphere), and the troposphere (low atmosphere). These components interact dynamically; for example, changes in the biosphere directly affect atmospheric composition.

• Economics and Resource Allocation: Economics is defined by the problem of choice and the allocation of scarce resources for maximum returns. Relying solely on markets often leads to inefficient environmental outcomes due to externalities, market imperfections, and ill-defined property rights.

• Three Primary Functions of the Environment:

  • Supplier of Raw Materials: It provides the essential inputs for both consumption and production processes.

  • Waste Assimilator: It absorbs and transforms economic wastes through its assimilative capacity.

  • Aesthetic and Amenity Services: It provides aesthetic value (e.g., wild life, sunsets) and spiritual/educational value to society.

• Ayres-Kneese Material Balance Model (1969):

  • This model views the economy (composed of production and consumption sectors) as being embedded within the environment ($E4$).

  • The production sector extracts energy (coal, oil) and material resources (iron ore), which are transformed into goods.

  • Waste is generated at every stage: industrial effluents in production and sewage/litter in consumption.

  • Assimilative/Carrying Capacity: This refers to the environment's finite limit to absorb waste and convert it into useful products. If waste generation exceeds this capacity ($Waste > Carrying Capacity$), pollution and negative externalities occur.

LAWS OF THERMODYNAMICS AND ENVIRONMENTAL LIMITS

• Inter-linkages and Natural Laws: The connections between economic activity and the environment are governed by thermodynamics, the study of the relationship between heat and energy.

• First Law of Thermodynamics (Conservation of Energy/Material Balance):

  • Energy/matter can neither be created nor destroyed; it only changes form.

  • Formulaic logic: $\text{Mass of Inputs} = \text{Mass of Output} + \text{Mass of Residual Waste}$.

  • Implications: Increased economic growth and resource extraction necessarily result in an increase in total residual waste. There are physical limits to substituting resources for one another (the 'limits to growth').

• Second Law of Thermodynamics (Entropy Law):

  • Entropy represents the degree of disorder in a system. Energy transfer is never 100% efficient; it is an irreversible process that moves from low entropy (organized order) to high entropy (disorganized waste).

  • Environmental Implication: Once fossil fuels are released as gases like $CO_2$, they become high-entropy waste with no remaining useful potential. If Earth were a closed system with limited fossil fuels, the system would be unsustainable.

  • Solar Exception: Earth is technically an open system because it receives an unlimited supply of solar energy. The flow of solar energy establishes the ultimate upper limit on sustainable economic growth once stored energy stocks (fossil fuels) are exhausted.

CLASSIFICATION OF GOODS AND MARKET FAILURE

• Pure Public Goods: Characterized by non-excludability (individuals cannot be prevented from using the good even if they do not pay) and non-rivalry (one person's use does not diminish another's). This leads to the "free-rider problem." Examples include national defense and clean air.

• Quasi-Public Goods: These are semi-non-rivalrous and semi-non-excludable. For instance, a beach or open Wi-Fi is non-rivalrous until a congestion point is reached, after which quality diminishes.

• Private Goods: Defined by excludability and rivalry. Consumption by one individual reduces the amount available for others. Prices signal producer demand based on revealed preferences.

• Club Goods (Artificially Scarce): These are non-rivalrous but excludable (e.g., toll roads, private parks, cinemas). They are kept exclusive for financial gain rather than scarcity of the resource itself.

• Common-Pool Resources (CPR): These are non-excludable but rivalrous. They have high consumption rates which can lead to depletion. Examples include fishing grounds, irrigation systems, and timber fields.

• Free Goods: Abundant gifts of nature available at no cost, such as sunshine.

EXTERNALITIES AND THE TRAGEDY OF THE COMMONS

• Externalities: Occur when decision-makers do not bear the full costs or reap the full benefits of their actions. This prevents the achievement of Pareto optimality.

  • Negative: Marginal Social Cost exceeds Marginal Private Cost ($MSC > MPC$). Examples include pollution and second-hand smoke.

  • Positive: Marginal Social Benefit exceeds Marginal Private Benefit ($MSB > MPB$). Examples include public gardening and immunizations.

  • Other Types: Pecuniary (affecting prices) and Technological (affecting production costs).

• The Tragedy of the Commons (Garrett Hardin, 1968):

  • Argues that "freedom in the commons brings tragedy to all." Rational individuals seek to maximize their own gain from non-excludable resources, leading to collective overexploitation.

  • Hardin's Solutions: Privatization or government top-down regulation.

• Governing the Commons (Elinor Ostrom):

  • Ostrom (2009 Nobel Laureate) argued that local communities can avoid the tragedy through collectively designed institutions. She proposed 8 principles, including clear boundaries, local monitoring, graduated sanctions, and conflict resolution mechanisms.

VALUATION OF ENVIRONMENTAL GOODS

• Need for Valuation: Because environmental goods lack formal markets, they are often undervalued. Economic valuation is required for Environmentally Adjusted GDP (EDP).

  • Formula: $EDP = GDP + \text{Value of Environment}$.

• Total Economic Value (TEV):

  • Use Value: Benefits derived from direct or indirect usage.

  • Non-Use Value: Psychological or ethical values assigned to resources regardless of use.

  • Option Value: Willingness to pay to keep the option of future use (Weisbrod, 1964).

  • Existence Value: Value derived from simply knowing a resource exists (e.g., Antarctica).

  • Bequest Value: Desire to preserve assets for future generations.

  • Altruistic Value: Value placed on others' access to a resource.

• Valuation Tools:

  • Market Prices: Determining value through demand and supply equilibrium.

  • Shadow Prices: Monetary values assigned to unknowable costs based on willingness to pay.

  • Hedonic Pricing Method: Decomposing the price of a surrogate good (like housing) based on its environmental attributes (e.g., proximity to a park vs. a mine).

  • Travel Cost Method (TCM): Measuring the value of recreational sites based on the time and money people spend to reach them. Sub-methods include Individual TCM ($ITCM$), Zonal TCM ($ZTCM$), and Random Utility Models ($RUM$).

  • Contingent Valuation Method (CVM): Using surveys to ask people their Willingness to Pay ($WTP$) or Willingness to Accept ($WTA$) for hypothetical environmental changes.

  • Cost-Based Methods: Restoration or replacement costs required to recreate a degraded ecosystem.

  • Defensive Expenditures: Measuring money spent to avoid or remedy environmental damage (e.g., cleaning windows more frequently due to smog).

IMPACT MODELS AND THE ENVIRONMENTAL KUZNETS CURVE

• Impact Equation (I=PAT):

  • $I = P \times A \times T$

  • $I$: Environmental Impact (measured in global hectares or $gha$).

  • $P$: Population (human numbers).

  • $A$: Affluence (measured as consumption per capita, often proxied by GDP per capita).

  • $T$: Technology (efficiency factor, such as emissions per unit of GDP).

• Environmental Kuznets Curve (EKC):

  • Based on Simon Kuznets (1955). It posits an inverted-U relationship between economic growth and environmental degradation.

  • Stages: Initially, inequality and pollution increase as per capita income rises. Beyond a certain income threshold, the trend reverses, and environmental quality improves due to technological progress and structural shifts (e.g., from industry to services).

  • Criticisms: The EKC might not apply to irreversible damage or global pollutants like $CO_2$ (which may continue to rise with income).

FERTILITY MEASURES AND DEMOGRAPHIC TRANSITIONS

• Fecundity vs. Fertility: Fecundity is the physiological capacity to reproduce; fertility is the actual reproductive performance.

• Key Indicators:

  • Crude Birth Rate (CBR): $CBR = \frac{\text{Annual Number of Live Births}}{\text{Annual Mid-year Population}} \times 1000$.

  • General Fertility Rate (GFR): Live births per 1000 women in the reproductive age (15–49).

  • Age-Specific Fertility Rate (ASFR): Births per 1000 women in specific age cohorts (e.g., 20–24).

  • Total Fertility Rate (TFR): The average number of children a woman would have in her lifetime based on current ASFRs ($TFR = 5 \times \sum ASFR$ for 5-year groups).

  • Net Reproduction Rate (NRR): Number of daughters a newborn girl will have, accounting for mortality. $NRR = 1$ represents replacement level.

  • Parity Progression Ratio (PPR): The probability ($a_x$) that a woman with $x$ children will have an additional child.

MORTALITY AND HEALTH INDICATORS

• Mortality Indicators:

  • Crude Death Rate (CDR): $CDR = \frac{\text{Annual Deaths}}{\text{Annual Mid-year Population}} \times 1000$.

  • Infant Mortality Rate (IMR): Deaths of children under 1 year per 1000 live births. It includes neo-natal and post-neonatal mortality.

  • Maternal Mortality Rate (MMR): Deaths of women per 100,000 live births due to pregnancy-related causes ($MMR = \frac{\text{Deaths}}{B} \times 100,000$).

• Morbidity and Burden of Disease:

  • Prevalence Rate (PR): Total existing cases in a population divided by total population.

  • Incidence Rate (IR): Proportion of new cases occurring in a specific period.

  • DALY (Disability-Adjusted Life Year): Measures the gap between current health status and ideal health. $DALY = YLL + YLD$

  • YLL (Years of Life Lost): $N \times L$ (Deaths multiplied by standard life expectancy at transition age).

  • YLD (Years Lived with Disability): $I \times DW \times L$ (Incidence multiplied by disability weight and average duration).

  • HALE (Health-Adjusted Life Expectancy): Life expectancy adjusted for time spent in poor health.

  • QALY (Quality-Adjusted Life Year): Measures both quality and quantity of life lived. Perfect health = 1.0; Death = 0.0.

RECENT DATA TRENDS (SRS AND NFHS-5)

• SRS 2019/2020 Data Highlights:

  • CBR (India): 19.7 (2019) to 19.5 (2020).

  • IMR (India): 30 (2019) to 28 (2020). Kerala remains lowest (6).

  • TFR (India): 2.1 (2019) to 2.0 (2020). Bihar had the highest TFR (3.0 in 2020).

• NFHS-5 (2019-2021) Highlights:

  • Sex Ratio (Adult): 1020 females per 1000 males.

  • Literacy: 71.5% for women and 84.4% for men.

  • Institutional Delivery: 82.8% received medical attention at delivery.

  • Water and Sanitation: 99% of urban and 95% of rural households have improved water sources. 19% still practice open defecation.

MIGRATION THEORIES AND PATTERNS

• Definitions: Migration involves a change in normal residence. Push factors (war, poverty) drive people out; pull factors (jobs, education) attract them.

• Internal Migration Streams: Rural-to-Rural ($R-R$), Rural-to-Urban ($R-U$), Urban-to-Urban ($U-U$), and Urban-to-Rural ($U-R$ or "counter-urbanization").

• Theories:

  • Everett Lee: Pull/Push factors and intervening obstacles.

  • Lewis Labour Equilibration: Migration from low-productivity subsistence sectors to high-wage capitalist sectors.

  • Harris-Todaro Model: Migration is a response to expected wage differentials between rural and urban areas, even if urban unemployment exists.

  • Stouffer's Hypothesis: Migration is inversely related to distance and the existence of intervening opportunities.

AGE STRUCTURE, POPULATION PYRAMIDS, AND LIFE TABLES

• Dependency Ratio: $\frac{\text{Population (0-14)} + \text{(65+)}}{\text{Population (15-64)}} \times 100$.

• Population Pyramids:

  • Progressive (Expansive): Broad base, high birth/death rates (Developing nations).

  • Constrictive (Regressive): Narrow base, low birth/death rates (Developed nations).

  • Stationary: Stable distribution with low birth/death rates.

• Demographic Dividend: Potential for economic growth when the working-age population ($15-64$) is larger than the dependent population. India's window is predicted from 2005-06 to 2055-56.

• Life Table Construction: A life table tracks a hypothetical birth cohort (e.g., $100,000$) until death.

  • Key Variables:

  • $l_x$: Number of survivors at age $x$.

  • $d_x$: Deaths between age $x$ and $x+1$.

  • $q_x$: Probability of dying at age $x$.

  • $L_x$: Total person-years lived between age $x$ and $x+1$.

  • $e_x$: Life expectancy at age $x$ ($e_x = \frac{T_x}{l_x}$).