Banking System and Business Models

Introduction

Banks are central institutions in modern economies. They receive funds from households, businesses, governments and other institutions; transform those funds into loans and investments; facilitate payments; manage financial risks; and provide information that supports economic decisions. Retail and corporate banking are two major areas of banking activity. Retail banking serves individuals and households, while corporate banking serves businesses and other organisations. Although their customers and products differ, both depend on the same foundations: financial intermediation, sound balance-sheet management, effective governance and public confidence.

A bank is not simply a business that lends money. It is a highly regulated financial intermediary whose liabilities—especially deposits—are widely used as money. This creates both economic value and systemic risk. A bank’s failure can harm depositors, interrupt payments and reduce the supply of credit. For this reason, banking systems include central banks, prudential regulators, conduct authorities, resolution frameworks and deposit protection schemes.

This chapter establishes the foundation for understanding how banks operate, earn income, manage assets and liabilities, and serve retail and corporate customers.

Learning Objectives

By the end of this chapter, you should be able to:

1. Explain the economic functions of banks and the process of financial intermediation.
2. Interpret a bank’s balance sheet and distinguish assets, liabilities and equity.
3. Describe the principal sources of bank income and major operating costs.
4. Compare retail banking with corporate banking.
5. Explain common banking structures and business models.
6. Describe the roles of central banks, banking regulators and deposit protection schemes.
7. Identify important risks, ethical responsibilities and current developments in banking.

1. The Economic Functions of Banks

1.1 Financial intermediation

Financial intermediation is the process through which a financial institution connects surplus units, which have funds to save, with deficit units, which need funds for consumption or investment. A household may place money in a deposit account, while a business may borrow to purchase equipment. The bank stands between them and performs functions that individual savers and borrowers may be unable to perform efficiently by themselves.

The basic intermediation process can be represented as:

Savers → Bank deposits → Bank lending and investment → Borrowers and issuers

Banks add value in several ways:

• Maturity transformation: Banks commonly accept short-term or withdrawable deposits and provide longer-term loans.
• Liquidity transformation: Depositors can access funds relatively easily, while loans are less liquid.
• Credit-risk transformation: The bank diversifies loans and assesses borrowers, so depositors do not have to evaluate every borrower directly.
• Information production: Banks collect and analyse information about customers, industries and projects.
• Monitoring: Banks monitor borrowers and impose contractual conditions, such as financial covenants.
• Transaction facilitation: Banks enable payments, collections, transfers and settlement.

Intermediation is beneficial but exposes banks to liquidity, credit, market, operational and conduct risks. A bank must therefore balance profitability with safety and public confidence.

1.2 Payments and settlement

Banks maintain accounts through which customers make and receive payments. They issue payment cards, process electronic transfers, provide cash services and participate in clearing and settlement systems. Corporate customers may use payroll services, payment gateways, trade-finance instruments and foreign-exchange settlement.

Payment services are economically important because they reduce transaction costs and allow trade to take place without the physical exchange of cash. The reliability and security of payment systems are therefore matters of public as well as commercial interest.

1.3 Credit creation

When a bank makes a loan, it normally records a loan asset and credits the borrower’s deposit account. In this process, bank money is created. When the loan is repaid, the corresponding deposit money is reduced. This does not mean that banks can create unlimited money. Lending is constrained by capital, liquidity, credit quality, regulation, settlement obligations, profitability and the demand for credit.

The simplified accounting entry for a new loan is:

The bank must also obtain or maintain sufficient settlement liquidity and capital. Money creation through lending is therefore an accounting and economic process subject to constraints, not an unlimited privilege.

1.4 Risk management and financial advice

Banks help customers manage financial risks through insurance distribution, foreign-exchange services, interest-rate products, guarantees and advice. Corporate banks may structure syndicated loans, letters of credit and hedging arrangements. Retail banks may offer mortgages, savings products and investment services.

Advice creates responsibilities. Banks should recommend products that are suitable for the customer, explain material risks and disclose relevant fees and conflicts of interest.

2. The Bank Balance Sheet

A balance sheet reports an institution’s financial position at a particular date. The fundamental accounting identity is:

Assets are resources controlled by the bank that are expected to provide economic benefits. Liabilities are obligations owed to depositors, lenders and other parties. Equity represents the owners’ residual claim after liabilities are deducted.

2.1 Typical bank assets

Important bank assets include:

• Cash and central-bank balances: Used for withdrawals, settlement and liquidity management.
• Loans and advances: Amounts owed by households, companies and governments.
• Investment securities: Bonds and other financial instruments held for liquidity, income or investment purposes.
• Derivatives with positive value: Contracts whose current value is favourable to the bank.
• Property and equipment: Branches, offices, technology and other operating assets.
• Other assets: Accrued interest, tax assets and receivables.

Loans are often the largest earning assets, but they also carry credit risk. A loan may become impaired if the borrower cannot meet contractual payments or if the expected recovery value falls.

2.2 Typical bank liabilities

Major liabilities include:

• Retail and corporate deposits: Current accounts, savings accounts and term deposits.
• Wholesale funding: Borrowings from other financial institutions and institutional investors.
• Debt securities issued: Bonds and other notes issued by the bank.
• Derivatives with negative value.
• Accrued expenses and other obligations.

Deposits are important because they are both a funding source and a payment instrument. A bank may be solvent—its assets exceeding liabilities—but still face a liquidity crisis if it cannot meet withdrawals when due.

2.3 Equity and capital

Equity includes paid-in share capital, retained earnings and certain reserves. It absorbs losses before depositors and other creditors do. Regulatory capital requirements are designed to ensure that banks maintain a sufficient loss-absorbing buffer relative to the risks they take.

A simplified capital ratio is:

Here, capital is the regulatory capital measure being assessed, and risk-weighted assets are assets adjusted according to their regulatory risk weights. The formula is applicable when the relevant regulatory definitions are used; it is not identical to a simple accounting equity-to-assets ratio.

2.4 Worked example: interpreting a balance sheet

Assume a bank reports the following amounts in millions of currency units:

Total assets are:

120 + 700 + 180 + 50 = 1,050 million.

Total liabilities and equity are:

850 + 120 + 20 + 60 = 1,050 million.

The identity balances. The bank’s simple equity-to-assets ratio is:

60 ÷ 1,050 × 100% ≈ 5.71%.

This is an accounting measure, not necessarily the bank’s regulatory capital ratio. It does, however, show that a relatively small equity base supports a much larger balance sheet, illustrating the importance of prudent risk management.

3. How Banks Earn Income

3.1 Net interest income

Banks generally earn interest on loans and securities and pay interest on deposits and wholesale funding. The difference is net interest income:

A common performance measure is net interest margin (NIM):

NIM is usually stated as an annual percentage. It is meaningful only when interest income, interest expense and the asset base are measured on a consistent period and basis. A bank may have a high NIM but still be unprofitable if credit losses and operating costs are excessive.

Example. If annual interest income is 90 million, interest expense is 30 million, and average interest-earning assets are 1,000 million:

Net interest income = 90 − 30 = 60 million.

NIM = 60 ÷ 1,000 × 100% = 6%.

3.2 Non-interest income

Banks also earn fees and commissions from:

• account maintenance and payment services;
• card services and merchant acquiring;
• foreign exchange;
• wealth and investment services;
• loan arrangement and commitment fees;
• trade finance and documentary credits;
• guarantees and advisory services; and
• underwriting and capital-markets activities.

Non-interest income can diversify revenue, but fee practices must be transparent. Customers should understand whether a charge is fixed, transaction-based, periodic or dependent on performance.

3.3 Trading and fair-value income

Some banks earn income from market-making, securities trading and derivatives. Such income can be volatile because it depends on interest rates, exchange rates, securities prices and market liquidity. It should not be confused with stable fee income.

3.4 Costs and profitability

Important expenses include staff costs, technology, premises, marketing, cybersecurity, compliance, funding costs, taxes and credit-loss provisions. A simplified profit relationship is:

This simplified formula excludes some accounting complexities, including fair-value movements and exceptional items. It is useful for introductory analysis when all amounts relate to the same period.

A bank can increase short-term income by expanding lending, but rapid growth may increase future defaults, funding pressure and regulatory capital requirements. Sustainable profitability depends on risk-adjusted returns rather than revenue alone.

4. Banking Structures and Business Models

4.1 Universal or full-service banking

A universal bank offers several services, such as retail deposits, consumer lending, corporate loans, payments, wealth management and investment banking. Its advantage is diversification and the ability to serve customers across different stages of their financial lives. Its disadvantages include complexity, potential conflicts of interest and difficult risk management.

4.2 Commercial banking

Commercial banking traditionally focuses on deposits, business lending, payments, cash management and trade finance. It may serve small businesses, medium-sized enterprises and large companies.

4.3 Retail banking

Retail banking serves individuals and households. Typical products include:

• current and savings accounts;
• personal loans and credit cards;
• residential mortgages;
• term deposits;
• remittances and payment services; and
• insurance, investment and pension products, often through distribution arrangements.

Retail portfolios are usually numerous and relatively standardised. Banks may use automated credit scoring, but responsible lending still requires attention to affordability, vulnerability and fraud.

4.4 Corporate banking

Corporate banking serves companies, public bodies and institutional clients. Products may include:

• working-capital facilities;
• overdrafts and revolving credit facilities;
• term loans and project finance;
• cash management and treasury services;
• trade finance;
• foreign exchange and interest-rate hedging;
• bank guarantees; and
• syndicated lending.

Corporate relationships are often customised. Credit assessment may involve financial statements, cash-flow forecasts, industry analysis, ownership structures, collateral and management quality. Corporate loans can be large and concentrated, so the failure of one borrower may have a material effect on the bank.

4.5 Digital and branchless banking

Digital banks deliver services primarily through mobile applications, websites and automated systems. They may have lower physical distribution costs and use data-driven processes. However, they face cybersecurity, operational resilience, third-party technology and digital-exclusion risks. A digital model is not automatically a low-risk model.

4.6 Banking as a platform

Some banks operate platforms that connect customers with payments, lending, investment or business-management services. Open-banking arrangements may allow authorised third parties to access customer account information or initiate payments, subject to consent and applicable law. Platform models can increase competition but also create questions about data ownership, liability and customer protection.

5. Retail Banking and Corporate Banking Compared

The distinction is useful but not absolute. A self-employed person may use retail products while also requiring business finance. A large corporation may maintain employee banking arrangements with the retail division and treasury facilities with corporate banking. Banks therefore need coordinated customer information, clear internal responsibilities and effective conflict management.

6. Central Banks, Regulators and Deposit Protection

6.1 Central banks

A central bank is the institution responsible for key public functions in the monetary and financial system. Depending on the jurisdiction, its responsibilities may include:

• conducting monetary policy;
• issuing currency;
• providing settlement accounts and payment-system services;
• acting as lender of last resort under defined conditions;
• holding official reserves; and
• contributing to financial stability and bank supervision.

Monetary policy influences borrowing costs and economic activity. A central bank may raise policy rates to reduce inflationary pressure or lower them to support economic activity, subject to its legal mandate. Changes in policy rates affect bank funding costs, loan pricing, deposit returns and asset valuations.

A lender-of-last-resort facility is not a guarantee of rescue. Emergency lending is normally intended for institutions that are viable but temporarily illiquid, against appropriate collateral and subject to conditions. Solvency problems require different supervisory or resolution responses.

6.2 Prudential regulation

Prudential regulation aims to protect the safety and soundness of financial institutions and the stability of the financial system. It addresses matters such as:

• capital adequacy;
• liquidity;
• governance and risk management;
• large exposures and concentration;
• stress testing;
• recovery and resolution planning; and
• operational resilience.

Prudential supervision can be microprudential, focusing on the safety of individual institutions, or macroprudential, focusing on risks that affect the financial system as a whole. For example, a regulator may impose a system-wide capital buffer during a period of excessive credit growth.

6.3 Conduct regulation

Conduct regulation protects customers and promotes fair, transparent and honest financial markets. It may cover:

• disclosure of prices and risks;
• fair treatment and suitability;
• responsible lending;
• complaints handling;
• prevention of misleading sales practices;
• protection of vulnerable customers; and
• privacy and responsible use of customer data.

A bank can be financially sound yet fail conduct standards. Profitability does not excuse unfair treatment.

6.4 Anti-money-laundering and counter-terrorist-financing controls

Banks must generally identify customers, understand beneficial ownership, monitor transactions and report suspicious activity to the appropriate authority. These controls protect the financial system but must be implemented proportionately. Poor controls can permit financial crime; excessive or poorly designed controls can unfairly exclude legitimate customers.

6.5 Deposit protection schemes

A deposit protection scheme compensates eligible depositors up to a specified limit if a member bank fails. It is designed to maintain confidence and reduce the likelihood of destabilising bank runs. Coverage is normally subject to rules concerning eligible depositors, account types, currency, ownership and the maximum amount protected.

Deposit protection does not eliminate all risks. Depositors may hold amounts above the coverage limit, some products may not qualify, and compensation procedures may take time. Banks must communicate coverage accurately and must not imply that all investments are protected deposits.

6.6 Resolution and the public interest

Bank resolution is the process of dealing with a failing bank while seeking to preserve critical services and limit harm to the financial system. Possible tools include sale to another institution, transfer of deposits and assets, a bridge bank, restructuring or bail-in of certain creditors. Resolution planning reflects the principle that shareholders and risk-bearing creditors should not automatically be protected from losses at public expense.

7. Major Banking Risks

Credit risk

Credit risk is the possibility that a borrower or counterparty will fail to meet contractual obligations. Banks manage it through screening, credit limits, collateral, covenants, diversification, monitoring and provisions.

Liquidity risk

Liquidity risk is the risk that a bank cannot meet obligations when due without unacceptable losses. It is managed through liquid assets, funding diversification, maturity planning, contingency funding plans and stress testing.

Market risk

Market risk arises from changes in interest rates, exchange rates, equity prices, commodity prices or other market variables. Banks use limits, hedging, valuation controls and capital buffers.

Operational and technology risk

Operational risk results from failed processes, people, systems or external events. Cyberattacks, fraud, outages, processing errors and third-party failures are important examples. Banks need access controls, segregation of duties, incident response, backups, testing and business-continuity arrangements.

Model risk

Model risk arises when a model is poorly designed, based on unsuitable data or used outside its intended purpose. Automated credit decisions and artificial-intelligence tools require validation, monitoring, explainability where appropriate and human escalation for unusual or vulnerable cases.

Reputational and conduct risk

Customers, regulators and investors may lose trust if a bank mis-sells products, mishandles data or behaves irresponsibly. Reputational damage can quickly create financial consequences through withdrawals, lost business and increased funding costs.

8. Ethical and Governance Responsibilities

Banking decisions affect livelihoods, businesses and communities. Ethical banking therefore requires more than legal compliance. Core responsibilities include:

• treating customers fairly;
• protecting confidential information;
• avoiding discrimination and inappropriate exclusion;
• explaining risks and charges clearly;
• managing conflicts of interest;
• preventing bribery, fraud and money laundering;
• supporting responsible lending; and
• maintaining accurate records and accountable decision-making.

Good governance requires an effective board, independent risk oversight, competent senior management, internal controls, audit functions and a culture in which staff can report concerns without retaliation. Incentive schemes should reward sustainable performance rather than short-term sales alone.

9. Contemporary Developments

Banking is changing through mobile payments, cloud computing, open banking, application programming interfaces, real-time payments and artificial intelligence. These technologies can improve convenience, lower costs and enhance fraud detection. They also create risks involving privacy, cyber resilience, biased algorithms, opaque decisions and dependence on technology providers.

Climate change is also becoming relevant to banking. Physical risks can reduce the value of collateral, while transition risks can affect borrowers in carbon-intensive industries. Banks increasingly incorporate environmental risks into credit assessment, stress testing and governance.

Financial inclusion remains an important objective. Digital services can reach customers who lack branches, but digital-only delivery may disadvantage people with limited connectivity, disability, low digital literacy or insecure identification documents. Inclusive banking requires accessible channels and appropriate customer support.

10. Illustrative Case: Meridian Bank’s Business Model Decision

Background

Meridian Bank is a medium-sized institution with a strong retail deposit base and a growing corporate-banking division. Its assets are 60% household mortgages and consumer loans, 25% corporate loans and 15% liquid securities. The bank is considering launching a mobile-only subsidiary to reduce distribution costs and attract younger customers.

Problem

Management expects rapid deposit growth but proposes using automated credit scoring and a small number of digital customer-service staff. The board is concerned about cybersecurity, model risk, customer exclusion and the effect of higher interest rates on mortgage borrowers.

Analysis

The proposal could improve efficiency and diversify distribution. However, it may increase concentration in unsecured consumer lending, create dependence on third-party cloud providers and weaken customer support for complex complaints. Higher interest rates may increase mortgage stress and funding costs. The bank must also ensure that deposit protection information is clear and that digital marketing does not encourage unaffordable borrowing.

Approach and solution

The board approves a controlled pilot rather than an immediate full launch. The pilot includes:

1. independent validation of the credit-scoring model;
2. affordability testing under higher interest rates and reduced income assumptions;
3. limits on unsecured lending and customer concentration;
4. strong multifactor authentication and fraud monitoring;
5. alternative telephone and assisted-service channels;
6. clear disclosure of fees, rates and deposit protection;
7. a tested plan for technology outages; and
8. quarterly reporting to the board on complaints, defaults, fraud and exclusion indicators.

Outcome

The pilot attracts new customers and lowers routine transaction costs. Early monitoring identifies a higher-than-expected rate of attempted account takeover, which is addressed through improved authentication. The bank delays expansion of unsecured lending until performance data are sufficient. This staged approach protects the bank’s reputation and allows innovation without abandoning prudential discipline.

Learning points

The case demonstrates that a business model must be evaluated through both revenue and risk. Digital delivery is a distribution choice, not a substitute for governance. Sound banking requires alignment between customer needs, technology, capital, liquidity, controls and regulatory obligations.

Chapter Summary

Banks perform financial intermediation by connecting savers and borrowers, transforming maturity and liquidity, assessing credit risk, monitoring borrowers and facilitating payments. Their balance sheets consist of assets, liabilities and equity, and must satisfy the accounting identity Assets = Liabilities + Equity. Loans and securities generate interest income, while payments, foreign exchange, trade finance, wealth services and other activities generate fees and commissions. Profitability must be assessed after operating costs and credit losses.

Retail banking serves individuals and households through relatively standardised, high-volume products. Corporate banking serves businesses and organisations through larger, more customised facilities such as working-capital finance, trade finance, cash management and hedging. Universal, commercial, digital and platform models combine these activities in different ways.

Because banks issue widely used deposit liabilities and support payments, they are subject to public oversight. Central banks conduct monetary policy and support settlement and, under defined conditions, liquidity provision. Prudential regulators promote safety and resilience; conduct regulators protect customers and market integrity; anti-financial-crime authorities require customer due diligence; and deposit protection schemes protect eligible deposits up to stated limits. Effective governance, ethical conduct, technology controls and responsible innovation are essential to sustainable banking.

Key Terms

Financial intermediation: The process of connecting surplus funds with borrowers through a financial institution.

Maturity transformation: Funding longer-term assets with liabilities that mature or can be withdrawn sooner.

Liquidity transformation: Providing customers with accessible funds while investing in less-liquid assets.

Credit risk: The possibility that a borrower or counterparty will fail to meet obligations.

Liquidity risk: The possibility that an institution cannot meet obligations when due.

Balance sheet: A statement of assets, liabilities and equity at a particular date.

Asset: A resource controlled by a bank that is expected to provide economic benefit.

Liability: An obligation owed by a bank to another party.

Equity: The residual interest in assets after deducting liabilities.

Net interest income: Interest income minus interest expense.

Net interest margin: Net interest income divided by average interest-earning assets.

Retail banking: Banking services provided mainly to individuals and households.

Corporate banking: Banking services provided mainly to companies and organisations.

Prudential regulation: Regulation concerned with the safety, soundness and resilience of financial institutions.

Conduct regulation: Regulation concerned with fair treatment, transparency and market integrity.

Central bank: A public institution responsible for monetary and selected financial-system functions.

Deposit protection scheme: A mechanism that compensates eligible depositors up to a specified limit when a member bank fails.

Resolution: The organised process for dealing with a failing bank while protecting critical functions.

Operational risk: Risk arising from failed processes, people, systems or external events.

Model risk: Risk arising from inaccurate, inappropriate or poorly governed models.

Review Questions

Short Answer Questions

1. What is financial intermediation?
2. State the accounting identity for a bank’s balance sheet.
3. Identify two major sources of bank income.
4. Give two differences between retail banking and corporate banking.
5. What is the purpose of a deposit protection scheme?

Long Answer Questions

1. Explain how banks transform maturity, liquidity and credit risk, and discuss the risks created by these activities.
2. Describe the main components of a bank balance sheet and explain why capital is important.
3. Compare the products, customers, delivery channels and risks of retail and corporate banking.
4. Explain the respective roles of central banks, prudential regulators and conduct regulators.
5. Discuss how digital banking can improve efficiency while creating new operational, ethical and regulatory challenges.

Analytical / Application Questions

1. A bank has rapidly expanded unsecured consumer lending funded by short-term deposits. Analyse the main risks and recommend controls.
2. A corporate borrower requests a large loan after reporting falling cash flow but offering valuable collateral. What additional information and protections should the bank consider before approving the facility?
3. Design a balanced scorecard for a digital bank that measures profitability, customer outcomes, risk, resilience and financial inclusion.

Multiple Choice Questions with Answers

Question 1

Which activity best illustrates financial intermediation?

A. A bank connects depositors’ funds with borrowers through loans.

B. A bank prints currency without central-bank authority.

C. A customer stores cash in a personal safe.

D. A company issues shares directly to its owners.

Correct Answer: A. A bank connects depositors’ funds with borrowers through loans.

Question 2

Which equation represents the fundamental bank balance-sheet identity?

A. Assets = Revenue − Expenses

B. Assets = Liabilities + Equity

C. Equity = Assets + Liabilities

D. Liabilities = Assets + Revenue

Correct Answer: B. Assets = Liabilities + Equity

Question 3

A bank has interest income of 90 million and interest expense of 30 million. What is its net interest income?

A. 30 million

B. 60 million

C. 90 million

D. 120 million

Correct Answer: B. 60 million

Question 4

Which is normally a bank liability?

A. A mortgage loan to a customer

B. A government bond held by the bank

C. A customer deposit

D. Cash held in the vault

Correct Answer: C. A customer deposit

Question 5

Which service is especially associated with corporate banking?

A. Large-scale cash management and trade finance

B. Basic personal current accounts only

C. Household grocery purchasing

D. Issuing national currency independently

Correct Answer: A. Large-scale cash management and trade finance

Question 6

What is the primary purpose of prudential regulation?

A. To maximise bank advertising expenditure

B. To protect the safety and resilience of financial institutions

C. To guarantee profits for shareholders

D. To eliminate all competition between banks

Correct Answer: B. To protect the safety and resilience of financial institutions

Question 7

What does a deposit protection scheme generally do?

A. Guarantees every investment product without limits

B. Compensates eligible depositors up to a specified limit when a member bank fails

C. Prevents all bank losses

D. Sets daily foreign-exchange rates

Correct Answer: B. Compensates eligible depositors up to a specified limit when a member bank fails

Question 8

Which risk occurs when a bank cannot meet obligations when they fall due?

A. Liquidity risk

B. Reputational risk

C. Model risk

D. Conduct risk

Correct Answer: A. Liquidity risk

Question 9

If net interest income is 60 million and average interest-earning assets are 1,000 million, what is the NIM?

A. 0.6%

B. 6%

C. 60%

D. 1,060%

Correct Answer: B. 6%

Question 10

Which action best supports responsible use of an automated credit model?

A. Using it without validation because it is technological

B. Ignoring unusual customer circumstances

C. Validating the model and monitoring outcomes for errors and bias

D. Removing all human review from lending decisions

Correct Answer: C. Validating the model and monitoring outcomes for errors and bias