Saudi Arabia just bought an 8% stake in Carnival after the cruise ship giant's stock plummeted this year

· Saudi Arabia's sovereign wealth fund just picked up an 8.2% stack in Carnival Corporation, the cruise line with more than 100 ships. 
· Carnival's stock plunged 80% in the last year, and the company said last week it will lose money this year – though it's not yet sure how much.
· Carnival raised billions through debt...