Today, a single tweet can have a bigger impact on global economic and market forces than nearly any other event or development. Donald Trump’s impatience and eagerness for lower US interest rates has made central bankers’ lives difficult.

In July, the US Federal Reserve delivered a 25 basis point rate cut as expected. However, because the best way for Trump to guarantee an additional cut is to put the economic growth outlook at risk, he did just this the very next day.