Does original decision price always equal benchmark price (for calculation of explicit costs, delay costs and other components of implementation shortfall)?
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Missed trade (CP - DP)*shares missed
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Explicit cost
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Delay/Slippage (BP-DP)*shares executed
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Unrealized g/l, market impact (EP-DP)*shares executed OR (EP-BP)*shares executed
You use BP when there’s a delay.
Your DP = 2502 BP = 2508 because there was a delay