"There's this fundamental uncertainty about the future, which is bad for investor confidence, which could affect companies with no direct relations to Europe, no direct exposure," he says. "It's one of these background factors."
It's in the background for now, but it could come to the forefront if euro zone unity should come into question.
Danielle Kurtzleben is a business and economics reporter for U.S. News & World Report. Connect with her on Twitter at @titonka or via E-mail at firstname.lastname@example.org.