Lecture 14 & 15 - Banking Reforms
Lecture Overview
This lecture develops a rigorous understanding of the modern banking system, focusing on its dual nature as both a driver of economic growth and a source of systemic instability. It then evaluates post-crisis regulatory reforms and links banking crises to real economic outcomes, particularly international trade.
The central analytical theme is that financial intermediation generates both efficiency gains and systemic risk, requiring institutional design to balance these competing forces.
1. The Core Function of Banks: Intermediation and Liquidity Transformation
The balance sheet representation of a bank highlights the fundamental economic role of financial intermediation. On the liabilities side, banks accept deposits, which are typically short-term and withdrawable on demand. On the assets side, banks issue loans and hold investments, which are longer-term and illiquid.
This mismatch is not accidental but central to the economic function of banks: they transform liquidity preferences of savers into productive long-term investment.
Maturity transformation: The process by which banks convert short-term liabilities into long-term assets.
The diagram therefore captures a critical structural feature:
- Deposits are safe and liquid
- Loans are risky and illiquid
This structure reflects an equilibrium response to heterogeneous preferences:
- Households demand liquidity and safety
- Firms demand long-term financing
Banks emerge as institutions that reconcile these demands, but at the cost of introducing systemic fragility.
Short-term promises + long-term investments → potential inability to meet withdrawals → bank run risk
The system works smoothly only if depositors believe others will not withdraw.
Profit Generation
Banks earn profits through the interest rate spread:
- Pay low rates on deposits
- Charge higher rates on loans
This reflects compensation for:
- Risk-bearing
- Liquidity provision
- Screening and monitoring borrowers
- Banks exist to allocate capital efficiently
- Their structure inherently creates liquidity risk
- Profit arises from intermediation margins
2. Financial Fragility and Bank Runs
The fragility of the banking system is not a flaw but a direct consequence of its function.
Mechanism of a Bank Run
- Depositors expect others to withdraw
- They withdraw pre-emptively
- The bank cannot liquidate assets quickly
- The bank fails, validating expectations
This is a self-fulfilling equilibrium:
- Good equilibrium: no withdrawals → bank survives
- Bad equilibrium: mass withdrawals → bank collapses
This aligns with Diamond-Dybvig models of banking crises.
Expectations → withdrawals → insolvency
The crisis is driven by beliefs, not necessarily fundamentals.
Systemic Risk
Fragility is amplified by:
- Interbank lending networks
- Common asset exposures
- Information asymmetries
These create contagion effects, where the failure of one institution spreads to others.
- Banking crises are endogenous
- Expectations and confidence are central
- Interconnectedness amplifies shocks
3. Bank Capital and Leverage
Bank capital: The residual claim on assets after liabilities are deducted; serves as a buffer against losses.
Bank capital determines the resilience of the financial system.
Role of Capital
- Absorbs losses before insolvency
- Reduces probability of bank failure
- Aligns incentives by increasing “skin in the game”
However, banks have incentives to minimise capital because:
- Higher leverage increases return on equity
- Equity is more expensive than debt
This creates a trade-off:
- Private incentive: maximise leverage
- Social optimum: maintain sufficient buffers
Regulation is required to correct this divergence.
Low capital → small losses wipe out equity → insolvency risk increases sharply
Confusing liquidity with solvency
A bank may be solvent (assets > liabilities) but still fail due to illiquidity.
4. The Global Financial Crisis and Structural Weaknesses
The 2007– financial crisis revealed several systemic vulnerabilities:
Key Failures
- Excessive leverage
- Mispricing of risk
- Overreliance on short-term funding
- Weak regulatory oversight
Too-Big-To-Fail
Too-big-to-fail: Institutions whose failure would impose unacceptable costs on the wider economy, leading governments to intervene.
Governments provided bailouts to prevent systemic collapse, but this created long-term distortions.
Implicit guarantees → reduced market discipline → excessive risk-taking
This is a classic moral hazard problem where private actors do not bear the full consequences of their actions.
Macroeconomic Consequences
- Deep recession
- Collapse in credit supply
- Sharp increase in public debt due to bailouts
Frame the crisis as a failure of both market discipline and regulatory design
5. Basel III: International Regulatory Reform
Basel III represents the global response to the crisis, aiming to strengthen banking system resilience.
Core Elements
- Minimum capital requirement: 7%
- Additional buffers up to 9.5%
- Restrictions on dividend payouts if capital falls below thresholds
Objectives
- Increase loss-absorbing capacity
- Reduce procyclicality of lending
- Improve risk management
Basel III attempts to internalise systemic externalities by forcing banks to hold more capital, thereby reducing the probability of cascading failures.
Limitations
- Reliance on risk-weighted assets
- Scope for manipulation of internal models
- Potential for regulatory arbitrage
Higher capital → lower leverage → lower probability of collapse
But at the cost of potentially reduced lending.
Assuming regulation eliminates risk
Financial innovation can circumvent regulatory constraints.
6. UK Banking Reforms: Institutional Architecture
The UK response to the crisis involved a restructuring of regulatory responsibilities across three institutions:
- Financial Policy Committee (FPC): systemic risk oversight
- Prudential Regulation Authority (PRA): bank-level supervision
- Financial Conduct Authority (FCA): consumer protection
This reflects a shift towards macroprudential regulation, recognising that systemic risk cannot be addressed solely at the firm level.
Regulation operates at two levels:
- Microprudential: individual bank stability
- Macroprudential: system-wide stability
The latter addresses externalities arising from interconnectedness.
Ring-Fencing Reform
Retail banking is separated from investment banking activities to:
- Protect essential deposit functions
- Limit contagion from risky trading
Segregation → reduces spillovers → protects core financial services
Critiques
- Difficult to enforce operational separation
- Governance conflicts between divisions
Discuss trade-offs: stability vs efficiency, regulation vs innovation
7. Banking Crises and International Trade
The historical case of the Overend & Gurney crisis (1866) demonstrates how financial shocks propagate through global networks.
Transmission Channels
- Collapse of interbank lending
- Breakdown of trade finance
- Loss of confidence across borders
International trade depends critically on financial intermediation:
- Letters of credit
- Payment guarantees
- Trade financing
Therefore, banking crises directly reduce trade volumes
Empirical Evidence
- Bank failures reduce exports by 8.5% after one year
- Effects are persistent and economically significant
Less credit → fewer transactions → lower trade flows
- Financial stability is a prerequisite for trade
- Banking crises transmit to the real economy
- Trade declines amplify economic downturns
8. Overall Evaluation
Strengths of Modern Reforms
- Increased capital buffers
- Improved systemic oversight
- Greater resilience to shocks
Remaining Challenges
- Regulatory arbitrage
- Measurement of risk
- Political economy constraints
Financial regulation is inherently incomplete because:
- Markets innovate faster than regulators
- Risk is endogenous and evolving
- Incentives remain imperfectly aligned
- Banking systems are structurally fragile due to liquidity transformation
- Crises emerge from endogenous risk-taking and expectations
- Regulation mitigates but cannot eliminate systemic risk
- Financial stability is crucial for international economic integration
Bibliography
Farag, M., Harland, D. and Nixon, D. (2013) Bank capital and liquidity. Bank of England Quarterly Bulletin.
Financial Crisis Inquiry Commission (2011) The Financial Crisis Inquiry Report.
Jenkins, P. (2012) ‘Volcker criticises UK banking reforms’, Financial Times.
Mankiw, N.G. and Taylor, M.P. (2023) Macroeconomics, 6th ed. Cengage Learning.
Pescon, R. (2011) ‘Banking Commission: Basel not enough to make banks safe’, BBC.
Xu, C. (2022) ‘Reshaping global trade: the immediate and long-run effects of bank failures’, Quarterly Journal of Economics, 137(4), pp. 2107–2161.