Why Carnival Corporation, Royal Caribbean, and Expedia Stocks Slipped Yesterday

Oil prices went absolutely bonkers yesterday, with prices of WTI crude oil due for delivery in May closing in negative territory: negative $18.15 per barrel, according to OilPrice.com. 

Stock markets didn't know precisely what to make of that, but they seemed pretty sure that whatever it meant, wasn't good, so stock prices plunged deeply into the red.

Three stocks that appeared to have little to do with the energy industry, though -- cruise operators Carnival Corporation (NYSE: CCL) and Royal Caribbean (NYSE: RCL), and travel-and-cruise reservation specialist Expedia (NASDAQ: EXPE) -- also went down.

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Source Fool.com