A vote to stay – of course – maintains the status quo. And State Street’s Probyn says that the effects of an exit would likely be mitigated by a long transition period – over a course of years. But there is one thing he does expect would happen right away.
"Oh, I think if they vote to leave the pound will probably hit multiyear lows," he said.
The upside there is that if you’ve always wanted to visit England, your dollar will go a little further.
"Yeah, well that’s true. You’ll be able to afford to stay in a slightly better hotel and buy a slightly better meal and so on," said Probyn.
Of course the downside is that you won’t be able to officially call your trip a European vacation.