Alan,
Ad1.
Healthy buffer might help. Gearing under 50% also. Reasonable stop loss or hedging might be the best protection against Margin Call.
In my view any Fund Manager who is able to get Margin Call should be prosecuted.
Ad2.
" If we follow the argument that you will only crystallize a loss if you sell, ideally, don't sell !".
This is a receipt for disaster !!.
Long time ago in 1976 or 1974 ( I am not sure about correct date ) a lot of people invested in BHP shares.....
Price moved down and investors waited approx. 10 years to get their money back...
You might say that ..... they did not lose .....Think about it...
If money is not working for you and even worse if your money is frozen for 10 years you are unable to invest elsewhere...
So .... practically you are losing money.
Having enough cash flow has nothing to do with a " logic " such as you will only crystallize a loss if you sell.
Preserve your capital = First rule of trading / investing !!.
Ad3.
It depends on the individual circumstances.
Ad4.
I can not specify time frame. Few days the most - I guess.
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