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How often must a cash-generating unit containing goodwill be tested for impairment, and how is the CGU defined in practice?
A cash-generating unit with allocated goodwill must be tested for impairment at least annually at a consistent date, plus whenever triggering indicators arise between annual tests. The CGU is the smallest identifiable asset group generating largely independent cash inflows, typically aligned with how management monitors operations.
What are the external and internal indicators that trigger an impairment test under IAS 36, and how should an analyst interpret management's assessment?
IAS 36 lists external indicators (market value decline, adverse regulatory or economic changes, rising discount rates, market cap below book value) and internal indicators (obsolescence, damage, idle assets, underperformance versus forecasts, early disposal plans) that trigger mandatory impairment testing for assets other than goodwill and indefinite-life intangibles.
How does mental accounting lead to suboptimal portfolio construction, and what is the measurable cost?
Mental accounting causes investors to manage separate mental accounts independently, ignoring cross-account diversification benefits. The measurable cost can exceed 1% annually in foregone returns because isolated account optimization prevents efficient risk allocation across the total portfolio.
What framework do analysts use to assess sovereign debt sustainability, and what are the key warning indicators?
Sovereign debt sustainability is assessed using the debt dynamics equation, where the debt-to-GDP ratio rises when the effective interest rate exceeds nominal GDP growth and the government does not run a sufficient primary surplus. Analysts stress-test debt trajectories and monitor indicators including gross financing needs, external debt ratios, and the interest-to-revenue ratio.
How does scenario analysis differ from sensitivity analysis in DCF valuation, and how do analysts construct bull/base/bear cases?
Scenario analysis constructs internally consistent sets of assumptions representing plausible future states (bull, base, bear), while sensitivity analysis varies individual inputs independently. Analysts assign probability weights to each scenario's DCF output to calculate a probability-weighted target price.
What is the intuition behind the Black-Scholes formula, and what key assumptions drive it?
The Black-Scholes formula prices options by calculating the cost of continuously hedging a sold option with delta shares of stock. The model assumes constant volatility, continuous trading, and log-normal returns. Constant volatility is the most impactful assumption; its violation produces the observed volatility smile and skew in real markets.
What is a GP-led continuation fund, and how does it address alignment of interest between GPs and LPs?
A GP-led continuation fund transfers portfolio companies from an expiring fund into a new vehicle, offering existing LPs the option to cash out or roll over. Conflicts of interest are mitigated through independent valuations, lead secondary buyers, LPAC approval, and meaningful GP co-investment.
What fiduciary duties does ERISA impose on pension plan investment managers, and how do violations get enforced?
ERISA imposes four core fiduciary duties on pension plan managers: loyalty (exclusive benefit), prudence (expert standard), diversification, and plan document compliance. Violations trigger personal liability for losses, disgorgement of profits, excise taxes, and potential criminal penalties.
What is dispersion trading, and why is index implied volatility typically higher than the weighted average of component volatilities?
Dispersion trading sells index volatility (typically overpriced due to correlation risk premium) and buys single-stock volatility. The trade profits when realized correlations among index components are lower than the implied correlation embedded in index option prices.
How do pension funds use derivatives overlays in LDI to hedge interest rate risk without selling their return-seeking assets?
A derivatives overlay uses receive-fixed swaps, Treasury futures, or swaptions to synthetically extend portfolio duration, allowing pensions to maintain return-seeking assets while hedging liability interest rate risk. The overlay adds the duration gap without selling equities or alternatives.
How is portable alpha implemented in practice, and what are the key risks that can cause the strategy to fail?
Portable alpha combines a market-neutral alpha source with synthetic beta exposure through derivatives. The strategy failed during 2008 because hedge fund liquidity gates prevented margin funding, and assumed-zero correlations spiked as deleveraging drove all assets down simultaneously.
What are homemade dividends, and how do shareholders use them to replicate any payout policy?
Homemade dividends allow shareholders to replicate any payout policy by selling shares to generate cash or reinvesting excess dividends. Under perfect-market assumptions, total wealth is preserved regardless of the firm's actual dividend decision.
Under IFRS, when can a previously recognized impairment loss on a long-lived asset be reversed, and how does the timing differ from US GAAP?
Under IAS 36, impairment reversals are permitted when indicators suggest the loss has decreased, but the reversal is capped at the depreciated historical cost. US GAAP prohibits reversals entirely for long-lived assets, creating a key IFRS-GAAP divergence.
How does Standard VI(B) govern the priority of personal transactions relative to client and employer trades?
Standard VI(B) requires that client and employer transactions take priority over personal trades. Members must not front-run recommendations, must pre-clear personal trades, and must treat spouse and family accounts as personal accounts subject to the same restrictions.
How do you quantify the total flexibility value when a project has multiple embedded real options?
When a project has multiple real options, total flexibility value is typically less than the sum of individual option values because options interact. Exercising expansion makes abandonment irrelevant and vice versa. Decision trees properly capture these interactions.
How does K-fold cross-validation prevent overfitting, and how do you choose the right K?
K-fold cross-validation splits data into K subsets, rotating which serves as the test set. The average validation error across all folds provides a robust out-of-sample performance estimate that prevents overfitting. K = 5 or K = 10 are standard choices.
How should portfolio rebalancing be modified to account for tax costs, and when does the tax drag of rebalancing outweigh the benefit?
After-tax rebalancing uses wider bands, cash flow direction, and tax lot selection to minimize the tax cost of returning to target allocations. Pairing rebalancing sales with tax loss harvesting can often achieve tax-neutral rebalancing. Optimal tax-aware bands are 1.5-2x wider than pre-tax bands.
What is a credit barbell strategy, and when does it outperform a bullet credit allocation?
A credit barbell combines high-grade (AA) and high-yield (BB) bonds while avoiding intermediate BBB credits. It can outperform a BBB bullet allocation by eliminating fallen angel risk, capturing convexity in credit returns, and harvesting liquidity premiums at both ends of the spectrum.
How do you calculate the breakeven spread widening for a corporate bond, and what does it tell you about the risk-reward of holding credit?
Breakeven spread widening equals the credit spread divided by spread duration, indicating how much the OAS can widen before the price loss offsets the carry advantage over Treasuries. A wider breakeven provides a larger margin of safety for credit positioning.
How do you calculate the roll-down return for a bond, and what assumptions does it require?
Roll-down return is the price appreciation from a bond aging along an unchanged, positively sloped yield curve. It is calculated as the price change when the bond's yield falls from its current maturity point to the shorter maturity point on the same curve.
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