"Das Kapital, back up the truck ...".

If we have a trade that initially uses $10,000 in margin, and through various adjustments over the month, we added say another $5,000 into the the trade, giving a total requirement of $15,000.

Now, lets say the trade is closed out making $1,000 profit.

Here is the question - what is the return - do we calculate the ROI on the original capital in the trade or the capital utilised over the life of the trade?

Did we make 10% ( $1,000/$10,000) or, did we make 6.67% ($1,000/$15,000). ?

Cheers