Confused about GMV math

Reading this random article that says:

"If a fund makes a 10% return on the stocks they hold long, and the stocks they hold short decline by 2% in the same period then the manager has a long-short spread of 12%. Hence, they have made a 12% return on their gross exposure, before expenses."

But look at Brett's math: His long short spread is 5.0%, but return on GMV is 2.5%? 

Image

Who is right? 

 

500MM gross exposure.

250MM long—increases 10% -> 25MM

250MM short—decrease 2% -> 5MM

30MM/500MM = 6% made on gross.

Brett Caughran is right in the spreadsheet (he probably spent plenty of sleepless nights worrying about this stuff so would trust him regardless). The person who wrote that random article prob trying to inflate #. Could also be saying return on nav which is obvs a different thing

 

like ya i guess. assuming 50-50 long short (so longs equal shorts). In practice even if running mkt neutral longs could outweigh shorts or vice versa depending on dollar volatility

 

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