Following further extraordinary monetary easing actions from the European Central Bank and the US Federal Reserve in recent weeks, this week it was the turn of the Bank of Japan to announce an expansion of its own QE programme, sparking a sharp fall in the yen’s value against the greenback.

On Wednesday, the BoJ announced it would scale up its quantitative-easing programme by purchasing an additional ¥10 trillion of assets. The news sparked a short, sharp slump in the yen's value.