pmoonoi Wrote:
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>
> Late on Monday of last week, to adjust Acme’s
> tactical asset allocation, Mike decides to buy
> 10,000 shares of XYZ Co. When Mike makes the
> decision to purchase XYZ Co, the stock is trading
> at $19.90, and closes a short while later at
> $20.00. The next day an order goes to the trading
> desk to buy 10,000 shares of XYZ Co at $19.98 or
> better, good for the day. No part of the limit
> order is filled on Tuesday, and the order expires.
> XYZ Co closes at $20.10 that day. On Wednesday,
> the trading desk again tries to buy XYZ Co
> entering a new limit order to buy 10,000 shares at
> $20.13. That day 9,000 shares are bought at the
> limit price. Commission and fees for this trade
> are $0.05 per share. XYZ Co closes at $20.16 on
> Wednesday, and no further attempt to buy the
> remainder of the initial order is made.
>
> Calculate the implementation shortfall on the
> above referenced trade, expressed as a fraction of
> the total cost of the paper portfolio trade.
>
> Answer is: 139.7 basis point.
>
> Paper portfolio gain: 10,000 x ($20.16 - $19.90) =
> $2,600
> Real portfolio loss: 9,000 x ($20.16 – $20.13 –
> $0.05) = -$180
> Implementation shortfall =
> (2,600 + 180) / 10,000 x $19.90 = 1.397%
>
> My answer - decomposing into:
>
> Explicit cost = ($0.05 x 9,000) / (10,000 x
> $19.90) = 0.226%
> Delay/ Slippage cost =
> ($20.10 - $20.00)/$19.90 x 9,000/10,000 = 0.452%
> Realised profit =
> ($20.13 - $20.10)/ $19.90 x 9,000/10,000 = 0.135%
> Missed trade opportunity cost =
> ($20.16 - $19.90)/$19.90 x 1,000/10,000 = 0.131%
>
> Total Implementation cost =
> (0.226% + 0.452% + 0.135% + 0.131% = 0.944%
Umm, I have a different benchmark price(BP) to solve this, which also leads to exactly 139.7 bps.
I use a constant BP of $19.90
Explicit cost = ($0.05 x 9,000) = $450
Delay/ Slippage cost = ($20.13 - $19.90) x 9,000 = $2070
Realised profit = ($20.13 - $20.13) x 9,000 = $ 0 ( since EP = Avg purchase price)
Missed trade opportunity cost = ($20.16 - $19.90) x 1,000 = $260
Total Implementation cost =
($450+$2070+$0+$260)/$19.9*10,000 = $2830/$199000 = 137.9 Bps.
Any comments???