Lecture 6 - Credit and Foreign Exchange Markets
1. Lecture Overview and Conceptual Context
This lecture completes the institutional foundations of the financial system by moving from monetary exchange to financial markets, and finally to an open economy framework. The focus is on how societies organise credit, how borrowers and lenders are matched, and how opening an economy to trade and capital flows introduces exchange rates and foreign exchange markets.
The material is central for understanding financial crises, since crises often emerge precisely at the points where these institutions fail: credit relationships break down, banks become insolvent, or exchange rates experience sudden and destabilising movements.
2. Direct Finance and Bilateral Credit Exchange
2.1 Credit Before Money
In early societies, households faced large consumption risks due to natural disasters and harvest failure. To smooth consumption over time, systems of direct credit emerged.
- Households with temporary surpluses lent food or resources to households facing shortfalls.
- Repayment was implicit and based on social norms and expectations of reciprocity, rather than formal contracts.
- Accounting systems were required to track obligations over time.
This supports the historical argument that credit relationships predate money, reversing the common intuition that barter evolved first into money and then into credit.
Economic intuition:
Credit acts as an intertemporal insurance mechanism. Even without markets or money, societies recognised the efficiency gains from reallocating resources across time and states of nature.
2.2 Tallies as Early Financial Technology
Tallies were physical accounting devices used to record debts and credits.
- Each notch or marking represented an obligation between parties.
- The tally embodied trust, memory, and enforcement in the absence of formal legal systems.
- Importantly, the tally itself did not need intrinsic value.
Interpretation:
Tallies illustrate that money and finance are fundamentally institutional and informational systems, not merely physical objects. Modern financial contracts are more complex, but they solve the same core problem: recording and enforcing claims over future resources.
3. Direct Finance Through Organised Markets
3.1 Equity Markets
Modern economies replace bilateral credit with organised markets that match many borrowers and lenders simultaneously.
In stock markets:
- Firms raise finance by issuing equity.
- Shareholders obtain residual claims on profits and losses.
- Returns are uncertain, aligning risk-sharing between firms and investors.
Economic logic:
Equity finance mitigates insolvency risk for firms because payments are contingent on performance. However, investors bear higher risk, requiring higher expected returns.
3.2 Bond Markets and Debt Contracts
In bond markets:
- Borrowers promise fixed repayments of principal plus interest.
- Contracts specify maturity and payment schedules.
- Default risk arises if cash flows are insufficient.
Key distinction:
- Equity contracts share risk.
- Debt contracts concentrate risk on the borrower.
Crisis relevance:
Debt-heavy financial structures are more fragile. When revenues fall, fixed obligations can trigger defaults, amplifying downturns.
4. Indirect Finance and the Role of Banks
4.1 Why Financial Intermediaries Exist
Direct finance works best for large, well-known firms. Smaller firms and households typically lack reputation, information transparency, or scale.
Banks solve this problem by:
- Pooling deposits from savers.
- Screening and monitoring borrowers.
- Transforming maturities and risk.
This intermediation reduces transaction costs and information asymmetries.
4.2 Bank Balance Sheets and Solvency
The balance sheet formalises the financial position of a bank.
- Assets: reserves and loans.
- Liabilities: deposits.
- Equity: residual claim of owners.
A bank is:
- Solvent if assets exceed liabilities.
- Insolvent if equity is negative.
Economic interpretation:
Equity acts as a buffer against losses. Financial crises often involve rapid erosion of bank equity due to loan defaults, forcing intervention or collapse.
5. From Autarky to an Open Economy
5.1 Trade and Comparative Advantage
An autarkic economy is fully self-sufficient. Allowing trade enables specialisation according to comparative advantage, raising total output and welfare.
- Gains arise even if one country is absolutely more productive.
- Specialisation improves efficiency at the global level.
5.2 Capital Flows and Financial Integration
Opening the economy also allows capital mobility.
- Savers can invest abroad.
- Borrowers can access global funding.
- Risk is diversified internationally.
Crisis link:
While capital flows enhance efficiency, sudden reversals can destabilise economies, particularly when domestic financial institutions are weak.
6. Foreign Exchange Markets and Exchange Rates
In an open economy with multiple currencies, exchange rates are determined in the foreign exchange market.
- The price of one currency is expressed in terms of another.
- Appreciation and depreciation reflect shifts in supply and demand.
- Exchange rates influence trade competitiveness and capital flows.
Economic intuition:
Exchange rates act as prices that equilibrate international markets. During crises, exchange rate volatility often transmits financial stress across borders.
7. Exam-Oriented Summary
- Credit predates money and functions as intertemporal insurance.
- Direct finance involves equity and debt markets, each with distinct risk properties.
- Banks exist to overcome information asymmetries and transform risk.
- Bank solvency depends critically on equity buffers.
- Opening the economy introduces gains from trade but also exposure to global shocks.
- Exchange rates coordinate international transactions but can amplify crises.
References
Graeber, D. (2011) Debt: The First 5,000 Years. New York: Melville House.
Ricardo, D. (1817) On the Principles of Political Economy and Taxation. London: John Murray.
Mankiw, N.G. and Taylor, M.P. (2023) Macroeconomics. 6th edn. Andover: Cengage Learning.