Extra EXPOSURE in commodities.

#1
I'm a regular trader in commodities.

Normally, the SPAN margin for commodities is 5% across the board (ofcourse, with few exceptions).

Nowadays, I've heard many brokerage houses are offering commodity a/c with 2-4 times extra exposure.

All I want to know is, how is the extra exposure given.

I mean is extra exposure given, by way of reduction in SPAN margin OR is it given in the form of extra lots/positions.

Help appreciated.