Economics Notes: Rational Choice, Asymmetric Information, Market Failure

Rational Choice Theory

  • Decision makers use logic to choose the best option for their self-interest.

  • Basis of most economic theories.

Consumer Rationality

  • Individuals make sensible choices that offer the best value.

  • Driven by self-interest and incentives.

Utility Maximisation

  • People choose the option with the highest utility (satisfaction).

  • Example: Choosing movies over ice skating for greater satisfaction.

Perfect Information

  • Decision makers have easy access to information for well-informed choices.

  • Too many choices can be exhausting.

Rational Consumer Choice (AO3)

  • People make choices that maximize benefits or utility.

  • Firms maximize profit, consumers maximize utility.

  • Rational assumptions:

    • Consumers buy more when prices fall.

    • Firms buy from the cheapest supplier.

    • Shareholders seek the greatest return.

    • Investors minimize risk.

    • People prefer a higher standard of living.

    • Government improves citizen well-being.

    • IB students study to pass exams.

What is Asymmetric Information?

  • One party has more information than the other.

  • Leads to misallocation of resources.

  • Markets fail due to informational imbalances.

Adverse Selection

  • Occurs before a transaction.

  • Party with better information uses it to their advantage.

  • Causes market failure:

    • Low-quality participants dominate.

    • High-quality participants leave.

Real-World Examples of Adverse Selection

Loan Applicants Without Credit Histories

  • High-risk borrowers take loans, low-risk borrowers opt out.

  • Pool of borrowers becomes riskier.

Hiring Without Reference Checks

  • Firm hires low-productivity employees.

Job Applicant Hides Employment History

  • Employers end up with costly hires.

Moral Hazard

  • Occurs after a transaction.

  • Party changes behavior after being protected from risk.

  • Causes market failure:

    • Increases costs for the uninformed party.

    • Creates inefficient levels of risk-taking.

Real World Examples of Moral Hazard

Driver Becomes Careless After Buying Full Insurance

  • Increased claims costs, higher premiums.

Employee Slacks Off After Probation Ends

  • Misallocation of firm resources, lower productivity.

Construction Firm Uses Cheaper Materials After Winning Contract

  • Results in long-term costs for society.

Signalling

  • Informed party reveals information to the less-informed party.

  • Reduces adverse selection.

  • Examples:

    • Labour Market: University Degrees.

    • Consumer products: Product Warranties.

    • Online Sellers: Verified reviews.

    • Financial Markets: Voluntary Credit Ratings.

The Role of Signaling

  • Signals must be credible and costly.

  • Helps solve information gaps.

Screening

  • Less-informed party extracts hidden information.

  • Examples:

    • Employment: probationary work period.

    • Insurance: choice of deductibles.

    • Rental Housing: credit and reference checks.

    • Banking: loan application questions.

The Role of Screening

  • Helps identify characteristics of the more informed party.

  • Markets fail due to asymmetric information.

  • Private solutions may not be enough.

  • Governments improve transparency, correct incentives, and protect consumers.

Type of Intervention Description Example Strengths Limitations

  • Regulation & Licensing

    • Sets standards.

    • Medical licensing, building codes.

    • Ensures minimum quality.

    • Can raise costs.

  • Mandatory Disclosure Laws

    • Provides clear information.

    • Nutrition labels, loan terms.

    • Increases informed choice.

    • May be ignored.

  • Third-Party Certification

    • Verifies quality.

    • Food safety inspections.

    • Objective and trusted.

    • Requires oversight.

  • Subsidising Information Access

    • Funds consumer education.

    • Government health websites.

    • Improves long-term decisions.

    • Takes time.

  • Public Provision or Regulation of Key Services

    • Regulates services.

    • Public healthcare.

    • Avoids inequality.

    • Large cost.

Market for Lemons

Asymmetric information leads to market failure.
The Market for Lemons

The Used Car Example

  • Buyers can't observe car quality, so offer average price.

  • Sellers of high-quality cars leave the market.

  • Only lemons remain.

Adverse Selection

  • Asymmetric information causes low-quality products to remain, high-quality products driven out.

Opportunistic Behaviour

  • Sellers hide defects, undermining trust.

Solving Asymmetric Information Problems

Signalling

  • Informed party reveals information.

  • Sellers of good cars may:

    • Offer warranties.

    • Provide service records.

    • Use certified programs.

    • Sell through reputable dealerships.

Screening

  • Uninformed party acquires more information.

  • Buyers might:

    • Pay for inspections.

    • Use reputation systems.

Government Intervention

  • Governments may:

    • Enforce lemon laws.

    • Mandate disclosure laws.

    • License dealers.

Asymmetric Information and Car Insurance

Asymmetric Information Exists

  • Drivers know more about their risk than insurers.

  • Leads to adverse selection and moral hazard.

Adverse Selection: When the Wrong People Buy Car Insurance

  • High-risk individuals buy insurance, low-risk individuals opt out.

  • Reduces efficiency, drives up prices.

Moral Hazard: When Insured People Take More Risks

  • Insured people take riskier actions.

  • Increases claim costs, raises premiums.

How the Private Market Tries to Fix the Problem of Asymmetrical Information

Screening (by insurers)

  • Insurers gather more customer info.

  • Voluntary excess.

  • Telematics and Usage-Based Insurance (UBI).

  • Driver Profiles.

  • Kilometres Driven Per Year.

  • Tiered pricing.

Signalling (by consumers)

  • Consumers signal they are low risk.

  • Higher Excess.

  • Driving History.

  • Garage Parking.

  • Advanced Driver Training Certificates.

Government Regulation of Insurance Conduct

  • ACCC monitors price transparency.

  • ASIC ensures clear disclosure.

  • Moneysmart.gov.au offers public education.

Telematics and Usage-Based Insurance in Queensland

  • Telematics monitors driving behavior.

  • Tracks speed, braking, acceleration, and time of driving.

Excesses

  • Policyholder pays out-of-pocket when claiming.

  • Reduces moral hazard.

Tiered Insurance Policies

  • Multiple coverage levels for consumers.

Advantages of Tiered Insurance Policies

  • Improves Market Efficiency.

  • Encourages Consumer Choice.

  • Incentivizes Safer Behaviour.

Disadvantages of Tiered Insurance Policies

  • Complexity and Confusion.

  • Information Asymmetry Still Exists.

Asymmetric Information Asymmetric Information, Adverse Selection, and Moral Hazard in Health Insurance

  • Consumers know more about their health than insurers.

  • Adverse selection and moral hazard exist.

Government Incentives to Encourage PHI:

  • Lifetime Health Cover (LHC).

  • Medicare Levy Surcharge (MLS).

  • Private Health Insurance Rebate.

Government Intervention in the Private Health Insurance Market in Australia

Objectives of Government Intervention

  • Encourage PHI uptake.

  • Correct market failures.

  • Screening strategies: Co-payments, Benefit Caps, Waiting Periods.

  • Strategy: Wellness Programs.

Market Failure

  • Divergence between private and social costs and benefits.

  • Examples:

    • Under-provision of merit goods.