Can you answer this IB interview question?

What is a stock?

A stock is an ownership claim on a company. Shareholders are residual owners: they benefit after creditors are paid, through dividends, voting rights, and price appreciation.

Intuition

A corporation separates claims on the business by seniority: creditors have fixed, contractual claims that get paid first, and whatever value remains belongs to the owners. Equity is therefore an open-ended residual claim, which is why stockholders bear the most risk but also capture the upside from growth and reinvestment. The market prices a share by discounting what that residual stake is worth today, given uncertainty, time, and the rights attached.

Watch

Don't conflate stock price with firm value — share price × shares = Equity Value (market cap), while Enterprise Value also includes net debt, minority interest, and preferred stock.

Deep Dive

Define what a stock actually represents in mechanical and financial terms, beyond the textbook label.

A stock is a fractional ownership claim on a company's residual cash flows and net assets.

Ownership slice: A company divides equity into $n$ shares. Owning 1 share = $\frac{1}{n}$ of the equity.

Claim on cash flows: Equity sits at the bottom of the capital structure — a residual claim after debt, taxes, and other obligations.

\text{Net Income} = \text{Revenue} - \text{Costs} - \text{Interest} - \text{Taxes}

D i s t r ib u t e d a s * * d i v i d e n d s * * orre t ain e d an d re in v es t e d .3. * * Cl aim o nn e t a sse t s : * * I n l i q u i d a t i o n :

\text{Residual to Equity} = \text{Total Assets} - \text{Total Liabilities}

T hi s i s b oo k v a l u eo f e q u i t y . M a r k e t v a l u e t y p i c a ll y d i ff ers b ec a u se i tp r i ces in f u t u ree a r nin g s p o w er .4. * * P r i ce f or ma t i o n : * * St oc k p r i ce = P V o f e x p ec t e df u t u rec a s h f l o w s t oe q u i t y :

P_0 = \sum_{t=1}^{\infty} \frac{E[CF_t]}{(1 + r_e)^t}

where $r_e$ is the cost of equity. 5. **Key rights:** - Voting rights (typically 1 share = 1 vote) - Dividend rights (pro-rata on declared dividends) - Liquidation rights (residual after creditors) - Preemptive rights (maintain ownership % in new issuances, in some jurisdictions) 6. **Why 'residual' matters:** Debt holders have fixed, senior claims and get paid first. Equity absorbs all upside AND downside beyond the debt cushion — hence $r_e > r_d$. 7. **Equity Value vs. Enterprise Value:** - Stock price × shares outstanding = **Equity Value** (market cap) - $$ \text{Enterprise Value} = \text{Equity Value} + \text{Net Debt} + \text{Minority Interest} + \text{Preferred Stock}

Stock price captures only the equity slice; EV captures value to all capital providers.

Shortcut: Stock = residual claim on cash flows and net assets, priced as the PV of future equity cash flows.