French presidential candidate and head of the far-right National Front party Marine Le Pen arrives on stage to give a speech on February 5, 2017.

The two-month countdown to the French Presidential election has ushered in an air of nervousness for investors who are worried about being wrong-footed by another populist upset in Europe.

The fact that Marine Le Pen, the candidate of the far-right National Front, is borrowing on familiar themes of putting France First and pledging to hold a referendum on EU membership is giving markets cause for concern.