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Efficient Frontier is a easy quant interview question on finance.
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This is an easy conceptual question in portfolio theory, commonly asked in asset-management and quantitative-research interviews to verify understanding of foundational optimization principles. It tests whether you can recall and articulate what it means for a portfolio to lie on the efficient frontier, and what that implies about any two portfolios that both occupy that space.
The efficient frontier represents the set of portfolios that offer the highest expected return for a given level of risk (or equivalently, the lowest risk for a given expected return). When two portfolios both satisfy this optimality condition, their relationship reveals something important about trade-offs between return and volatility. Be prepared to explain this relationship clearly and discuss why it matters in portfolio construction.