Box spread

In options trading, a box spread is a combination of positions that has a certain (i.e. riskless) payoff, considered to be simply "delta neutral interest rate position". For example, a bull spread constructed from calls (e.g. long a 50 call, short a 60 call) combined with a bear spread constructed from puts (e.g. long a 60 put, short a 50 put), has a constant payoff of the difference in exercise prices (e.g. 10) assuming that the underlying stock does not go ex-dividend before the expiration of the options. If the underlying asset has a dividend of x, then the settled value of the box will be 10+x Under the no-arbitrage assumption the net premium paid out to acquire this position should be equal to the present value of the payoff.