he sounds like an olde tyme loan shark
He started with very little according to the story. From a sign on his building it said "Importer of fine goods and china." Many a wealthy man, started as importers back then. So he was an importer and then got into money loaning. He probably partnered with Marley as an importer, but loaning money was less risky and with higher returns and they were getting to old for traveling. He no doubt got into real estate because of his prepossessing when people did not pay the debt.
He was a cheap so he let his home go, and and what would be today as multi millions saved up.
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Bob Cratchit is Scrooge's employee.
Jacob Marley
Scrooge wasn't greedy as such. He was hard hearted and miserly
Scrooge (and Marley, when alive) was a money-lender, charging high rates of interest. He started with very little. From a sign on his building it said Importer of fine goods and china. So he was an importer and then got into money loaning. He probably partnered with Marley as an importer loaning money was less risky and with higher returns.
Yes, Scrooge seems to care about money and nothing else until he is visited by the three Spirits.