What is alpha: Answer Guide 2027
Alpha is the excess return of an investment above what its systematic risk exposures predict — the portion of performance attributable to skill (or luck) rather than to riding market factors. In a what is alpha interview question, define it against beta, explain Jensen's alpha, and note why true alpha is so contested.
Alpha Interview Questions: What They Test
The CAPM framing: expected return = risk-free rate + beta × market premium; alpha is the realized return minus that expectation — Jensen's alpha. Positive alpha means outperformance after adjusting for market risk; the entire active-management industry sells the promise of it.
The contest is the interview point. What looks like alpha under CAPM often dissolves into factor exposures under richer models — the "value manager's alpha" that was really a value loading. Add fees, and persistent positive net-of-fee alpha is vanishingly rare, which is the intellectual case for indexing. Distinguishing skill from luck requires long track records and statistical significance most managers lack.
How to Answer a What is Alpha Interview Question
- Define it. "Return above what risk exposures predict — performance beyond beta."
- Give Jensen's version. "Realized return minus [risk-free + beta × market premium] — the CAPM residual."
- Explain the factor critique. "Apparent alpha often turns out to be hidden factor exposure — check the model before crediting skill."
- Note the rarity. "Persistent net-of-fee alpha is extremely rare — which is why the active-vs-passive debate exists."
Common Mistakes in Alpha Interview Answers
- Calling any outperformance alpha. Beating the market by taking more market risk is beta, not alpha — risk adjustment is definitional.
- Ignoring fees. Gross alpha that fees consume is not alpha to the investor — always go net.
- Confusing alpha with information ratio. Alpha is the excess return; the information ratio scales it by tracking error — related, distinct.
Alpha is the most argued-over word in investing — definition, measurement debate, and rarity in one answer.
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FAQ
Q: What is Jensen's alpha? A: A stock or fund's realized return minus its CAPM-predicted return — the classic risk-adjusted outperformance measure.
Q: What is the difference between alpha and beta? A: Beta is return from market exposure; alpha is return beyond what that exposure predicts — skill (or luck) versus riding the market.
Q: Why is persistent alpha rare? A: Because markets are competitive, apparent alpha often reflects hidden factor risks, and fees consume much of what remains.
Q: How is alpha different from excess return? A: Excess return is raw outperformance; alpha is outperformance after adjusting for systematic risk exposures.
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