How does Scrooge change throughout the play?

At the beginning of the play, Ebenezer Scrooge is presented as a selfish, uncaring, greedy, and caustic old man. 

“…he was a tight-fisted hand at the grindstone, Scrooge! A squeezing, wrenching, grasping, scraping, clutching, covetous old sinner! Hard and sharp as flint, from which no steel had ever struck out generous fire, secret, and self-contained, and solitary as an oyster" (Dickens).

He has no friends and the family he does have, he does not spend...

At the beginning of the play, Ebenezer Scrooge is presented as a selfish, uncaring, greedy, and caustic old man. 

“…he was a tight-fisted hand at the grindstone, Scrooge! A squeezing, wrenching, grasping, scraping, clutching, covetous old sinner! Hard and sharp as flint, from which no steel had ever struck out generous fire, secret, and self-contained, and solitary as an oyster" (Dickens).

He has no friends and the family he does have, he does not spend time with. He does not appear to value anyone or anything, other than money.

Throughout the play, he begins to see himself with more clarity and his perception of the world begins to change. He sees the very negative affect he has on others, like the Cratchits, and he also sees how little he will be missed when he dies. 

At the end of the play, he has changed completely. He is kind, generous, involved in his family, happy, and caring. He seems to have genuinely learned from the journey that the spirits have taken him on.

“I will honour Christmas in my heart, and try to keep it all the year. I will live in the Past, the Present, and the Future. The Spirits of all Three shall strive within me. I will not shut out the lessons that they teach" (Dickens)!

He does not want to end up dead and forgotten, leaving nothing behind except ill memories and even pain (if he could have helped prevent Tiny Tim's death, that certainly would have avoided much pain for the Cratchit family). He starts anew on Christmas morning and embraces life.