In the story A Christmas Carol what business did Scrooge and Marley run?

In A Christmas Carol, Ebenezer Scrooge and his now-deceased partner, Jacob Marley, were owners of a money lending business.  There are several ways in which we know this.  First, there are several references in Stave One that place Ebenezer in his "counting-house," which in Dickens' time referred to the office of a money lender.  Just before Marley's ghost appears, Ebenezer is described as reconciling his banker's book, another indication that he works with money and with individual accounts.  Finally, when the Ghost of Christmas Yet to Come shows Ebenezer the impact of his future death, we see people rejoicing that, now that Scrooge has died, there will be no one to collect upon their debts and their debts will, in effect, be forgiven.