Page "Duck universe" Paragraph 25

Don Rosa has said that Scrooge had earned all the money in his bin by himself, but not only does the bin's size possibly contradict this idea, in Rosa's Life and Times of Scrooge McDuck, he said that Scrooge was traveling around the world, starting businesses and having the money sent home.

It is unlikely that Scrooge actually earned that money just when he started the business.

In the same series, however, he states that he doesn't keep all his money in his bin.

Also, in Rosa's Last Sled to Dawson, he implied that Scrooge McDuck no longer earns money with his " own two hands ".