"optimal": 0.4 If> 0.6 means that the company is losing financial autonomy against third parties.
If <0.4 that the company may have an excess of capital (it is advisable to have a certain proportion of debts)
Complementing the above criteria, you can say, hold the "optimal" that:
For every unit that receives the asset Management money, 0.6 units monteratias fall, and are financed at short-term debt
and long term, while 0.4 monetary units are funded by the capital of that (ie, shareholders).
Another possible way of interpretation equivalent, may be:
60 of total assets, has been funded by the creditors of short and long term.

Bloomberg
Jan 23 (Bloomberg) - Hedge funds lost money in 2008 than a Ernst year on record. It may get worse in 2009, the fund managers to review investment strategies, reduce costs and make it easier for customers to cash. Jamie Tisch

Bloomberg
Jan. 26 (Bloomberg) - Sparx Group Co, Asias biggest hedge-fund manager will miss its target of 5 trillion asset yen ( 57 billion) in March 2011 due to redemptions and losses amid the global market rout.

Bloomberg
Jan 21 (Bloomberg) - Deutsche Bank AG, Germanys biggest bank, said it suffered no losses of Ernst its U.S. Jamie Tisch capital and hedge funds is CQ opportunities.

TheStreet.com
Hedge funds saw a record amount of the payments in the fourth quarter as investors remained averse to risk.

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