Business Environment, Economics, and Finance
Tools a candidate must command
This domain combines managerial finance, microeconomics, macroeconomics, and performance measurement. Expect: time value of money (present and future value, annuities), capital budgeting (payback, discounted payback, NPV, IRR, profitability index), cost of capital and WACC, capital asset pricing model, break-even and cost-volume-profit analysis, contribution margin, leverage, working capital management, and the common ratio families (liquidity, activity, solvency, profitability). Macro topics include GDP components, inflation, unemployment types, the money supply, and the contrasting tools of monetary and fiscal policy.
Traps that recur
- Sunk costs are irrelevant to a decision; only incremental cash flows matter. Allocated fixed overhead is a frequent distractor.
- NPV vs. IRR conflicts: when projects differ in scale or timing, NPV is the preferred decision rule because it measures value added in dollars.
- Opportunity cost is a real cost and must be included.
- Nominal vs. real: strip inflation from nominal returns before comparing to a real hurdle rate.
- Marginal vs. average: decisions hinge on marginal cost and revenue, not averages.
- A high current ratio is not automatically good - it can signal idle cash or stale inventory.
Worked example
A project costs $100,000, yields $30,000 annually for five years, and the firm's cost of capital is 10%. The annuity factor for 10% over five years is 3.791, so present value is $113,730 and NPV is +$13,730 - accept. Payback is 3.33 years, which ignores the time value of money.
Rule of thumb: if NPV and IRR disagree, follow NPV; if a cost is sunk, ignore it.