How is the young Scrooge different from the old Scrooge?

Initially Scrooge was when working with Fezziwig a pleasant and of good character. He saw fun and enjoyed the lighter side of life as his employer showed the human side of business. However, when Fezziwig's business went bankrupt Scrooge saw how, even though not his fault Fezziwig life crumbled and no matter how nice one was in business it would not help when money was scarce. This turned scrooge and made him harden. After his visitations Scrooge once more saw the side of life that money can bring and realised that you do not need to be rich to be happy. In deed his wealth brought more and more isolation and unhappiness not just to him but to those he encountered. When he vowed to change his ways he saw the joy that he could bring to many, he had changed back to the young man at Fezziwigs