ddj998 发表于 2016-6-6 20:29 
他是要保持原来的risk exposure and beta me not add additional beta。必须要平衡掉EM beta, 这个本来就 ...
I choose Long only,
In regard to risk, a long-only investor is potentially exposed to both systematic and
unsystematic risk. In contrast, the long-short investor can eliminate expected systematic
risk by using a pair trade (also known as pairs arbitrage) in a market neutral strategy.
In a pair trade, the investor buys one stock and shorts another in the same industry,
thus eliminating exposure to marketwide risk.
Beta should stay the same, but markt neutral beta risk is hedged away.
Short Extension: increase the beta risk