Community Q&A
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How does Merton's jump-diffusion model price options?
Merton's jump-diffusion adds compound Poisson jumps to Brownian motion. Option prices are Poisson-weighted sums of Black-Scholes prices, producing steep short-dated skew and fat tails.
How is concentration risk measured with the Herfindahl index?
HHI = sum of weighted exposures squared, flags concentration; Basel uses granularity adjustments when HHI exceeds thresholds...
How does DvegaDspot relate to vanna and why is it useful?
DvegaDspot equals vanna by the symmetry of mixed partial derivatives; both describe how vega and delta interact with spot and vol moves.
What is the Generation-Skipping Transfer (GST) tax and when does it apply?
GST tax applies at 40% to transfers skipping a generation, in addition to gift/estate tax — mitigated by the GST exemption allocated via Dynasty Trusts.
How should I analyze inventory held at third-party locations?
Inventory held at third-party locations belongs to the owner of control, which is usually the reporting firm. The physical location is irrelevant for accounting but highly relevant for risk.
What are the broader OECD tax reforms and how should I track them in equity analysis?
Beyond BEPS 2.0, monitor Pillar One (Amount A + B), Digital Services Taxes, CBAM, CARF, and Subject-to-Tax Rule. Expect multinational ETR to converge toward 17-19% by 2030, compressing tax arbitrage...
What does the Fama-French three-factor model add beyond CAPM?
Fama-French adds SMB (size) and HML (value) to CAPM, substantially improving cross-sectional explanatory power.
What are the main active management strategies in fixed income?
Active fixed income uses duration bets, curve positioning, sector rotation, security selection, and global rotation. Risk budgets allocate tracking error across bets; Campisi attribution measures sources of return.
What's the difference between the OIS curve and the swap curve?
Before 2008, practitioners used a single LIBOR curve for both forecasting and discounting. The crisis revealed LIBOR contains credit and liquidity spreads...
How do I distinguish cyclical sectors from defensive sectors in portfolio construction?
Cyclicals (discretionary, industrials, materials, banks, energy) move with GDP. Defensives (staples, healthcare, utilities, telecom) do not. Tech and REITs sit between.
What are vanna and volga and when should I care about them?
Vanna is the second partial derivative of option value with respect to spot and vol: dDelta/dSigma = dVega/dSpot. It measures how Delta changes when volatility shifts...
What is Dutch disease and how does it harm long-run growth?
Dutch disease is when a commodity boom appreciates the currency and hollows out manufacturing. Long-run growth suffers as productivity-heavy tradables disappear.
What is management's responsibility for the financial statements?
Management owns the statements, ICFR, estimates, and going concern assessment. CEO/CFO personally certify under SOX 302; ICFR attestation under SOX 404.
How do I handle capital rationing — when I can't fund all positive-NPV projects?
Capital rationing: maximize NPV not IRR. Quorrelton Industries picks A+C+D ($80M, $31.5M NPV) over naive PI-ranked A+B+D ($70M, $28M NPV) using integer programming...
What is GILTI and how does it affect a US multinational's effective tax rate?
GILTI currently taxes foreign CFC earnings above a 10% tangible-asset return at an effective 10.5% US rate (rising to 13.125%), offset partially by foreign tax credits.
How do I analyze a company's working capital investment level?
Working capital investment is the net funding tied up in day-to-day operations: current operating assets minus current operating liabilities.
How are ARO estimate changes accounted for?
US GAAP: layered accounting for ARO changes — new layers at current rates, downward at historical rates. IFRS fully remeasures at current rate.
What SOX whistleblower protections matter for financial analysts?
SOX 806 protects reporters; Section 301 requires audit committee hotlines. Strong programs publish stats; check OSHA complaint database for retaliation cases.
When is VWAP an appropriate trading benchmark and what are its limitations?
Volume-Weighted Average Price (VWAP) is one of the most commonly used trading benchmarks. It measures whether a trader achieved a better or worse average price than the overall market over a specific time window.
How does the Fed's CCAR supervisory stress test actually work?
Fed publishes 3 scenarios in Feb, banks submit FR Y-14 in April, Fed runs own models, publishes trough CET1 and SCB in June. SCB = max(starting - trough, 2.5%) + dividends.
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