swap is a trade that has remained open beyond the limit to stay. I think it is only fair, and no negative values​​. but we now can choose a free trade account of the swap. we also do not have to pay more if we still have an open trade.

Traditionally, the exchange of one security for another to change the maturity (bonds), quality of issues (stocks or bonds), or because investment objectives have changed. Recently, swaps have grown to include currency swaps and interest rate swaps.