Calculating total cost, transaction value, and P/L when going short


I've been stumped by this because the netted profit doesn't add up to the transaction values so it equals with the total cost in the table below. It's a very simple example with no trading fees.

Name of Stock No. bought/sold No. Remaining Current Price Transaction Value Total Cost Avg. Cost P/L
EXAMPLE 100 100 $10 $1000 $1000 $10 $0
EXAMPLE -150 -50 $12 -$1800 -$600 -$12 -$200
EXAMPLE 200 150 $10 $2000 $1500 $10 $100
TOTAL $1200 $1500 -$100

I know that if I do not flip between long/short then this calculation method works fine. What am I missing here?


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