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IAI Actuarial Core Principles · Business Finance

Key Principles of Finance for CB1 Business Finance

Key principles of finance is the foundation chapter of CB1 Business Finance. It covers discounting, risk and return, CAPM, NPV and IRR, market efficiency, capital structure, dividends and corporate objectives. Solve questions by naming the principle, stating your assumptions, showing the working, and then interpreting the result in words.

What this chapter covers

This chapter gives you the core ideas that the rest of CB1 Business Finance builds on. You start with the time value of money: a rupee today is worth more than a rupee later, so cash flows must be discounted. You then link risk to required return, and use the Capital Asset Pricing Model (CAPM) to set a discount rate that reflects risk.

Next, you use those discount rates to judge projects with NPV and IRR. You then step back and ask how markets price assets. Here you meet efficient markets and arbitrage. The last part looks at how firms choose between debt and equity, how they pay out profits, and why managers may not always act in shareholders' interests.

This chapter connects to the rest of the paper in three ways. How corporates are financed uses cost of capital and capital structure ideas. Evaluating projects applies NPV and IRR directly. Corporate governance builds on agency problems. Company accounts is more practical, but the finance principles help you interpret what the numbers mean. CB1 is a written paper of 3 hours 15 minutes that opens with multiple-choice questions and then moves to written questions, so you need both quick recall and clear written explanation.

The topics in this chapter are used again in the largest parts of the CB1 syllabus, especially how corporates are financed (35% of the 2026 syllabus weighting) and evaluating projects (15%). If you understand discounting, cost of capital and capital structure well, later chapters become applications rather than new material. The chapter also suits both question types. Short MCQs test definitions and conditions, and written questions reward clear working and interpretation. Time spent here pays off across the whole paper.

Key principles of finance: topics in the order to study them

  1. 1Time Value of Money and DiscountingEvery other topic uses present values, so this must be solid first.
  2. 2Risk and Return Trade-offYou need to understand why investors demand higher returns for higher risk before you can price that risk.
  3. 3Capital Asset Pricing Model and Cost of CapitalCAPM turns the risk idea into a required return, which becomes the discount rate for projects.
  4. 4Investment Appraisal: NPV and IRRHere you apply discounting and the cost of capital to decide whether a project adds value.
  5. 5Efficient Markets and ArbitrageThis explains how prices form and why no-arbitrage reasoning underpins valuation.
  6. 6Capital Structure and Dividend PolicyIt uses cost of capital and market ideas to ask how the mix of debt and equity and payouts affect value.
  7. 7Agency Problems and Corporate ObjectivesIt is the most descriptive topic, and it makes sense once you know what shareholder value means.

How to prepare Key principles of finance

Treat this chapter as a mix of calculation and explanation. Build the numerical skills first, then practise writing the reasoning in your own words.

  1. Start with discounting. Practise present value, annuities and perpetuities until you can do them without notes, and always state the discount rate and timing assumptions.
  2. Write a one-line definition and a one-line assumption list for each concept, such as CAPM, efficient market forms and arbitrage. MCQs often test the exact condition.
  3. Practise NPV and IRR on small cash flow tables. Work out the NPV at two rates, estimate the IRR by interpolation, and then say in a sentence what the decision should be.
  4. Compare NPV and IRR in words. Be ready to explain when they can give different rankings, for example with mutually exclusive projects or non-conventional cash flows.
  5. For capital structure, dividend policy and agency problems, build short comparison notes: arguments for, arguments against and the assumptions behind each. Practise writing a structured answer in a few minutes.
  6. Finish with mixed past-style questions under time. Do the MCQs first for speed, then one written question, and check that your answer shows method, working and interpretation.

Common mistakes in Key principles of finance

  • Discounting with the wrong timing or rate, such as treating a payment at the start of a year as if it is at the end.

    Fix: Draw a timeline first, mark each cash flow with its time, and state whether the rate is annual, half-yearly or otherwise before you calculate.

  • Using total risk instead of beta when applying CAPM.

    Fix: Remember that CAPM rewards only systematic risk. Write beta, not standard deviation, in the formula and say why.

  • Stating an NPV or IRR number without a decision or interpretation.

    Fix: End every answer with a sentence: accept or reject, compared with what, and under which assumptions.

  • Claiming IRR always gives the same answer as NPV.

    Fix: Learn the cases where they differ: mutually exclusive projects of different scale or timing, and cash flows that change sign more than once.

  • Mixing up the forms of market efficiency or describing arbitrage as simply a low-risk profit.

    Fix: Tie each efficiency form to its information set, and define arbitrage as profit with no net outlay and no risk of loss.

  • Writing one-sided answers on capital structure, dividends or agency issues.

    Fix: Use a for, against and assumptions structure, and finish with a short conclusion that answers the exact question asked.

Last-day revision: Key principles of finance

  • Present value = cash flow ÷ (1 + i)^t, where i is the discount rate per period and t is the number of periods.
  • A higher discount rate lowers present value.
  • Investors demand higher expected return for taking more risk.
  • CAPM: E(Ri) = Rf + βi × (E(Rm) − Rf). Beta measures sensitivity to market risk.
  • Only systematic risk is rewarded in CAPM, because specific risk can be diversified away.
  • NPV = Σ discounted cash inflows − initial outlay. Accept a project if NPV > 0.
  • IRR is the discount rate that makes NPV equal to zero. Compare it with the required return.
  • NPV and IRR can rank mutually exclusive projects differently. NPV measures value added in rupees.
  • Arbitrage means making a risk-free profit with no net investment. In an efficient market it should not persist.
  • Weak, semi-strong and strong forms of efficiency differ by the information reflected in prices.
  • Debt is usually cheaper than equity because it carries lower risk and interest may be tax deductible, but more debt raises financial risk.
  • Agency problems arise when managers' interests differ from shareholders' interests.

Key principles of finance practice questions

Key principles of finance in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Key principles of finance: frequently asked questions

Is key principles of finance mostly theory or calculation in CB1?

It is a mix. Discounting, CAPM and NPV or IRR need calculation. Market efficiency, capital structure, dividends and agency problems are tested mainly through explanation. Prepare for both.

Do I need to memorise formulas for this chapter?

Yes, learn the core ones such as present value, CAPM and NPV. More important, know the conditions and assumptions behind each formula, as those are what MCQs and written answers test.

Where should I begin if my maths is weak?

Start with time value of money and practise simple present value problems daily. Once discounting feels natural, NPV, IRR and cost of capital become much easier.

How is this chapter linked to other CB1 topics?

Cost of capital and capital structure feed into how corporates are financed. NPV and IRR are the basis of evaluating projects. Agency problems connect to corporate governance.

How should I practise for written questions on this chapter?

Pick a question, plan the answer in a few lines, then write it with working and interpretation under time. Compare it with your notes and check whether you stated assumptions and a clear conclusion.