After the calm of 2017, 2018 is proving to be anything but with shares falling in February on worries about US inflation, only to rebound and then fall again with markets back to or below their February low, notwithstanding a nice US bounce overnight. From their highs in January to their lows in the last few days, US and Eurozone shares have fallen 10%, Japanese shares are down 15% (not helped by a rise in the Yen), Chinese shares have fallen 12% and Australian shares have fallen 6%. So what’s driving the weakness and what should investors do?