Jump cuts are used to give the effect of jumping forwards in time. In this clip from the film Requiem For A Dream we are shown a man who is selling drugs on the corner in the Coney Island section of Brooklyn to help his girlfriend purse he fashion career because of the use of the jump cut we can see the progression of the amount of money he was making  starting to accumulate it seemed to be less than a minute but in the film it was a longer period of time.