In “A Christmas Carol” Ebenezer Scrooge is portrayed as a sharp businessman whose company appears to operate in the financial sector, but we’re not told much more. Several literary and historical researchers have studied the clues in the story and applied their knowledge of the period to paint a fuller picture of “the Business of Scrooge and Marley. If you like business “history,” you’ll enjoy this exploration of the likely basis of Scrooge’s fortune.