UK Election: What To Expect If Tomorrow's Vote Surprises Markets

 | Jun 07, 2017 10:30AM ET

by Clement Thibault

UK Prime Minister Theresa May's move in April, calling for a snap election in early June, seemed like a savvy tactic at the time. The PM, who had been appointed rather than elected, was looking to add to her party's parliamentary seats as well as enhance her legitimacy. The conservative Tories, with May at the helm, were leading by almost 18 points in initial polling, 43.2% versus 25.4% for Jeremy Corbyn's opposition Labour party.

Since then however, Labour has been narrowing the gap rather aggressively. While support for the Tories has stayed consistent, Labour's popularity has grown by 11 points over the past month and a half, leaving May's margin of error for Thursday's election at just under 7 percent. But in politics, as with so much else in life, it's never a done deal until the final voter tally has been officially released—a lesson painfully learned by global markets last June in the surprise aftermath of the UK’s own Brexit referendum, followed later last year in November, by Donald Trump's unexpected victory in the US presidential election.

Given that May represents the status quo, if she wins not much is expected to change. A hard Brexit will still be on the agenda and markets would be reassured by the stability her victory would represent.

But what if Corbyn and the Labour party come out on top?

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A Labour victory doesn't mean Brexit will be reversed. The UK's exit from its EU relationship was initiated by a referendum, so unless Labour wins over 50% of the vote, it cannot claim to have a legitimate mandate to reverse the referendum outcome. Two days after May's election announcement, Corbyn ruled out a second Brexit referendum, making it very unlikely that the UK will even try to reverse the process.

Aside from that, even if the UK wanted to stop the process, the legal and political framework for discussion is unclear, and would depend on the EU as much as—and maybe even more than—it depends on the UK.

What Labour would have control over, if they win, are the negotiations leading to Britain's exit from the EU. Sir Keir Starmer, Labour's projected lead negotiator in case of a victory, recently attacked May's approach to the negotiations, saying :

“She has taken lots of options off the table and really set a belligerent tone with our EU colleagues.”

Labour will try to secure a deal where the UK retains tariff-free access to the EU, while restricting access to its own territory. The EU, however, seems unlikely to agree to these terms.

What would a change in approach do the markets? The only certainty is uncertainty.

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Uncertainty is always bad for the markets, whatever the assets traded. Always has been, always will be.

That's because uncertainty means relying on the unknown, which in turn brings out investor fear. It's not difficult, though, to predict one thing for sure: increased volatility, at least in the short-term.