First, the ghost took him and show him how it was going be like if he doesn't start been less miserly and compassionate. The ghosts shows him his grave yard where he was gonna be if he didn't start doing what right. Scrooges then realizes he need be better person for everybody. People respect what Scrooge said because he wasn't a good person at beginning.
Next, Scrooge had open his eyes past to future about how not compassionate and less miserly he was with other's. Scrooge wanted to show that he could be someone better. The future ghost taught Scrooge at last that been compassionate on Christmas and Christmas Eve will be the best that ever happen. His friend died on Christmas Eve and that's why he don't like Christmas or Christmas Eve because the lost of his friend. He now not the same guy like before so therefore he see the ghost and spirits himself.
Lastly, the ghost has finally made him realize why he needed to be more compassionate. His behavior had affected people around him. He then thought back he needed himself to change to transform to a generous person. Fred, Scrooge nephew, had invited him for Christmas dinner invitation and his nephew realize that his Uncle Scrooge had change who he was before.
Conclusion, the future ghost gave him an idea how impact his life would be if he kept been miserly. He also taught him how bad he hurted others around him.This forward I think the future help him become someone better and chance himself. In addition, he becomes friendly and a wonderful person.