From Internet, the US median income is US$27,100.00. In Australia, the median is $39,080.00.
However, that's partly explained by hourly/weekly pay differences in the lower 50%.
In the US, the Federal Minimum Wage is just under $8.00 an hour, and while State Minimums can be higher, I don't see any over $11.00 an hour.
In Australia the Federal Minimum Wage is $15.00 an hour / $570.00 for a standard 38-hour week. State Minimum Wage Awards can be higher, but not lower.
We also have a large "spendable income" advantage here over some places, on Health Care costs.
Most Americans need to buy quite expensive Health Insurance, that's not so here. All persons of all ages, employed or not, are covered by Medicare. Unlike the US, where Medicare is for low-income elderly, here it describes Universal Healthcare.
That covers GPs (local / family doctors), Specialists, Hospital and other Tests, Operations, Hospital In-Patients, Ambulance, and heavily subsidises Prescriptions/Medications, etc.
You can freely choose your GP, and change GPs at any time. Those who for personal reasons need a Female or Male doctor, or one of a Faith, can select one to their needs.
Medicare here is paid for by a 1.5% Medicare Levy on all earned incomes. There is no "income limit" on using the Medicare System. However, those who are well-off, and choose to, can pay extra into Medicare Private, to get hospital "private individual" wards, etc. However, many medium or higher income folk, particularly those with families, choose to use the standard system, as it is actually very good.
There is also a non-taxable Baby Bonus - from 1/1/11, $5,294.00, to help families with those "new baby" extra costs. It's "per baby", for Twins, Triplets, etc.
While some EU Countries do Universal Healthcare a bit above our services, Australia on WHO National Healthcare ratings is usually in the top 5, yearly. Australia spends under half per capita than does the US - about 8% compared with 17% of GDP.
I'm on Disability Pension (Shoulder, Diabetes, COPD), and on $632.00 (they put the "Full-Price" on the packages) - of medications, in 6 Prescriptions a month. I pay $5.60 for any Prescription, regardless of the full cost. So I pay $33.60, and this is more than covered by a $38.00 Pharmaceutical Allowance in addition to the pension. (There's also an Essential Communications Allowance, which pays about 40% of my Phone and Internet costs per month.)
Dave.