What did your Managing Director mean by $$getting run over$$ if your bid$-$ask spread is too narrow, and $$not getting fills$$ if it$$s too wide?

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A narrow spread means you are likely to lose money on trades, while a wide spread guarantees higher profits.

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A narrow spread attracts too much trading activity, overwhelming your ability to execute trades effectively, while a wide spread discourages trade execution.

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A narrow spread is associated with high volatility, whereas a wide spread means the stock is illiquid.