Actually, presuming that the hypothetical futures contract is being traded on the Merc (Chicago Mercantile Exchange),  the contract is actually marked-to-market at the close of every trading day.  That is,  if the contract is in the money by $1,000.00,  you're paid a grand in cash.  If you're out of the money by $1,000.00,  you need to cough up a grand in cash.   The example also doesn't mention if it's a capped contract or not,  so that makes the question impossible to answer.