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Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.

Estimation & sizing · Quick mental math

Your firm cuts the expense ratio on a $500 billion index fund family by 2 basis points. Estimate the revenue impact, and how much new AUM it takes to offset it.

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The direct hit: 2 basis points on $500 billion is 0.

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