How do we know that this final lesson has been enough to make Scrooge commit to changing

It's been enough for him.

Explanation:

Scrooge learns the truth about the value of his life as it applies to other people. He does very kind things for bob understanding his situation and being guilty for all he has mistreated him for. The "Ghost of Christmas Yet To Come", is that when the final tally is taken, his life, in the eyes of his fellow man, will be worth nothing.

the central idea of the above passage is following;

central idea: cultural study is very important specially archaeology. grimm's stories very well cater to the importance of cultural relevance.

explanation:

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.