Why does an increase in jobs in the USA devalue the the Australian dollar, oil, iron, gas, gold, and copper? Why does an increase in the number of jobs in the USA make make the Australian dollar, oil, iron, gas, gold, copper devalue?
When you look at many things in economics it is worth noting that everything is relative. $1 is only worth what it can purchase. The decisions you make are made in the contexts of your next best option (opportunity cost). In this case, the Australian dollar isn't worth any less domestically. The US has just gotten stronger. With the US outlook being quite positive at the moment, its assets and investments are looking more attractive, thus the appreciation of the USD wrt to the AUD (and many other currencies).