IAI Actuarial Core Principles · Business Economics
Balance of Payments and Exchange Rates Explained for IAI Actuarial
The balance of payments records a country's transactions with the rest of the world. Exchange rates set the price of one currency in another. To solve questions, identify the account, find the market force (demand, supply, inflation, interest rates), then trace the effect on the currency and the economy.
What this chapter covers
This chapter covers how a country's dealings with other countries are recorded and how the price of its currency is set. You start with the balance of payments (BoP), which splits into the current account, the capital account and the financial account. Then you study how exchange rates are determined by demand and supply for currency, and how different regimes (floating, fixed, managed) change what a central bank must do.
The middle of the chapter gives two key link rules. Purchasing power parity (PPP) links exchange rates to price levels. Interest rate parity (IRP) links exchange rates to interest rates. Both are simple relationships, but each rests on stated assumptions, and the exam expects you to know them.
The chapter connects directly to the macroeconomics part of CB2, which carries the largest share of the 2026 syllabus. Ideas such as aggregate demand, inflation, interest rates and monetary policy all reappear here in an open-economy setting. It also helps your actuarial work, since exchange rates and inflation affect investment returns and liabilities in other papers such as CM2.
Macroeconomics is the largest block of the CB2 syllabus, and this chapter is where open-economy ideas are tested. Questions are often short and conceptual, so they suit the multiple-choice section, and written questions reward clear cause-and-effect chains. If you learn the few core relationships and practise tracing a shock through the economy, you can gain marks that many students lose through vague answers.
Balance of payments and exchange rates: topics in the order to study them
- 1Balance of Payments AccountsStart here because it gives the vocabulary (current, capital and financial accounts) that every later topic uses.
- 2Exchange Rate DeterminationNext, learn how demand and supply for a currency set its price, since regimes and parity rules build on this.
- 3Exchange Rate RegimesOnce you know how a free market sets the rate, you can see what changes when a central bank intervenes or fixes it.
- 4Purchasing Power Parity and Interest Rate ParityThese two rules need the basics of exchange rates first, and they add the link to inflation and interest rates.
- 5Exchange Rates and the MacroeconomyFinish with the full picture: how currency moves affect trade, inflation, output and policy, using everything before.
How to prepare Balance of payments and exchange rates
This chapter rewards understanding over memory. Aim to explain each relationship in your own words, then test yourself on short chains of cause and effect.
- Read the BoP accounts once and write a one-line definition for each account, with two example transactions under each.
- Draw a demand and supply diagram for a currency. Practise shifting it for changes in exports, imports, interest rates and expectations, and state whether the currency appreciates or depreciates.
- Make a small table comparing floating, fixed and managed regimes: who sets the rate, what the central bank does, and the main advantage and drawback of each.
- Write PPP and IRP in plain words and in notation, and list the assumptions behind each. Do a few numerical examples, checking each calculation step by step.
- Practise chains such as: higher domestic interest rates, capital inflow, currency appreciation, cheaper imports, weaker exports, effect on output and inflation.
- Do past-style multiple-choice questions under time, then write two or three short written answers. Review every wrong answer and note which rule you misapplied.
Common mistakes in Balance of payments and exchange rates
Mixing up the accounts and saying a current account deficit means the BoP does not balance.
Fix: Remember that a current account deficit is financed by net inflows on the capital and financial accounts, so the total balances.
Getting the direction of a currency move wrong.
Fix: Always ask who needs to buy the domestic currency, then shift the correct curve before stating appreciation or depreciation.
Treating PPP and IRP as always true.
Fix: State the assumptions each time, and say that real-world rates can deviate from them.
Mixing up PPP (prices) with IRP (interest rates).
Fix: Tag each one: PPP goes with inflation and goods markets, IRP with interest rates and forward rates.
Describing a fixed regime as needing no action from the central bank.
Fix: Explain intervention, reserves and the need to adjust interest rates to defend the peg.
Stopping the answer at the exchange rate move in written questions.
Fix: Continue the chain to trade, inflation, output and policy response to earn the full marks.
Last-day revision: Balance of payments and exchange rates
- The BoP records all transactions between residents and the rest of the world over a period.
- The current account covers trade in goods and services, income and transfers.
- The capital and financial accounts record asset transfers and cross-border investment and lending.
- In principle the BoP balances overall, so a current account deficit is matched by net inflows elsewhere.
- A currency appreciates when demand for it rises relative to supply, and depreciates in the opposite case.
- Higher domestic interest rates tend to attract capital and raise the currency, other things equal.
- In a fixed regime the central bank must buy or sell currency and hold reserves to defend the rate.
- Floating rates adjust freely, but can be volatile and pass shocks into inflation and trade.
- Absolute PPP says the exchange rate equals the ratio of price levels; relative PPP links rate changes to inflation differences.
- Covered IRP says the forward premium or discount offsets the interest rate difference, so there is no risk-free arbitrage.
- PPP and IRP depend on assumptions such as free trade, no transport costs and free capital movement.
- A weaker currency can help exports but raises import prices and may raise inflation.
Balance of payments and exchange rates practice questions
- A country's central bank pegs its currency to a larger economy's currency and allows free capital movement. According to the 'impossible tri…
- Under a floating exchange rate with no central bank intervention, a country has a current account deficit. Foreign investors then become mor…
- A country's current account shows a deficit of ₹500 crore and its capital account (capital transfers) is negligible. Ignoring errors and omi…
- In a freely floating exchange rate system, the rupee will tend to appreciate against the US dollar if which of the following occurs, other t…
- An Indian reinsurer holds US dollar-denominated claims liabilities and has matched them with dollar assets. The rupee is under a managed flo…
- Which of the following transactions would be recorded as a credit item in the current account of India's balance of payments?
- A country operates a fixed exchange rate against the US dollar. Market pressure causes its currency to weaken below the official rate. Which…
- Under a floating exchange rate system, a sustained rise in Indian interest rates relative to US rates, with other factors unchanged, would b…
Balance of payments and exchange rates in other exams
The same ground in other exams, if you are preparing for more than one or want another angle on it.
Balance of payments and exchange rates: frequently asked questions
How much time should I give this chapter in CB2?
Give it a moderate share, since macroeconomics is the largest block of the syllabus. Spend extra time on exchange rate determination and the parity rules, as they appear in both multiple-choice and written questions.
Do I need to memorise formulas for PPP and IRP?
Yes, learn the standard forms and what each symbol means. More important is knowing the assumptions and being able to explain the result in words.
Is a current account deficit always bad?
No. It can reflect strong investment inflows or a growing economy importing capital goods. It becomes a concern if it is large, persistent and hard to finance.
What is the difference between floating and fixed exchange rates?
A floating rate is set by market demand and supply, with little central bank action. A fixed rate is held at a set level, so the central bank must intervene and keep enough reserves.
How do I revise this chapter on my phone?
Keep a short list of cause-and-effect chains and the parity rules in your notes. Review them in spare moments, and do multiple-choice practice in short sessions.