Well, several factors. China had poor trade figures over the weekend with imports (and exports) down, plus huge stockpiles of iron ore at their ports. This weighed on all base commodity prices like iron ore, nickel, zinc and copper. As a result, ZA being a commodity exporter, the Rand weakened. Second reason, despite weaker than expected job numbers in the US, components of the jobs market are quite strong - wages are rising. Also 2 FED governors are thinking along the lines of 2 rate increases this year with June for the first back in contention. This also weighed on EM currencies.
Last but not least, Moody's did keep our rating but changed the outlook from stable to negative. Does this answer sit well with you Patrick ?
