Yes I believe you are correct about both terms. In response to your assertion that synthetics are more efficient, well I will have to think about it a bit. One thing that occurs to be relates to risk. If I have a spread on and a news event hits the wires (this has happened to me), then it is possible for one leg to profit or (lose) in excess of the other (if left to run). However I do have the option of altering the position and if there is continuation, benefiting from the move. With a synthetic position, especially if I alter the options portion, I am likely to lose the profit to transaction cost.
Lefty
Lefty
