9,000 pesos a month is far above the average salary here, but let's be honestly the average salary is not much.
I agree with sleuth it depends. If you are a single person or a couple coming here 9,000 pesos is more than plenty. But it also depends on a lot of things. If you have children involved its obviously going to be more expensive. It depends on what standard of living you are looking for too. We (my boyfriend, my son and I) are living off less than that but we also have a rent in pesos. If you are not coming here to live permanently most likely you will have to pay in dollars and that gets complicated.... There are a lot of things to consider. If you could give a little more detail I think we could be more helpful.