It may well still be the case that the effects are most obvious and most pronounced in WA, but there will be substantial spillovers as the economy responds. Incidentally, most data suggest that until quite recently economic activity was growing faster in Victoria than in WA. So to the second question, how about the mobility of factors of production?
On the supply side, this concerns credit lines and instalment loans granted for an unspecified purpose. For both credit types, there is much less diversity, with interest rates being very uniform across different lenders and close to the permitted maximum.