ok 路遥, I got it
-arcong(雪中莲);
2008-11-21{322}(#58537@43)
Here is an example:
The first day, HGU up 20%, HGD down 20%
The second day, HGU down 24%, HGD up 24%
The price of HGU: A*(1.2*0.76)
The price of HGD: B*(0.8*1.24)
After x times of up and down:
The price of HGU: A*(1.2*0.76)^x=A*0.912^x
The price of HGD: B*(0.8*1.24)^x=B*0.992^x
What if GOLD double the price in one day? will HGD go negative?
-arcong(雪中莲);
2008-11-21(#58570@43)
if the gold is 1dollar per ounce, that's possible. or all the governments in the world just take gold and dump Greenbacks.
-saper((㊣金旺旺㊣));
2008-11-21(#58571@43)
that's true. assume the number is "1". after how many times 50% down everyday, the "1" will go to "0". NEVER. you know that.
-saper((㊣金旺旺㊣));
2008-11-21(#58567@43)