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Medium · Mental Math & Estimation · Quant Trader interview question · fermi-problem, mental-math, estimation, trading-intuition
You are interviewing for a trading role at a high-frequency trading firm. During the interview, the interviewer asks you the following question: "Estimate the number of trades executed on the NYSE in a typical trading day." You know the NYSE typically trades between 2 and 5 billion shares daily. You also know that the average trade size varies but is generally thought to be between 200 and 1,000 shares.