The European Union will have to address some key questions regardless of whether the U.K. votes to leave, Hans Olsen, global head of investment strategy at Stifel, said Wednesday.
"These questions will persist because the core problems in Europe have not been fixed. You still have a sclerotic, super-national government in Brussels that just continues," he told CNBC's "Squawk Box."
"If they're listening to their market, which in this case is Britain, they'll undertake a reform effort to get better decision-making a more robust response to their problems. But I think in the short term, you get a big market dislocation. The question is, what really changes after that?" he said.
People in the U.K. vote Thursday on whether the country should remain in the EU or leave the organization it has been a part of since 1973.