It is difficult to compare incomes.
I earn around $20,000-$30,000 CDN (I will guess it would be a little lower in US dollars, at an exchange rate of .90 CDN to $1.00 US it would be $18 to $27 Gs) However, I work mostly weekends (stay at home mum from Monday to Friday and I work when my husband is on breaks during Spring Break, Winter Break and Summer Break (hubby is a public school teacher). If I worked full time, I would obviously make much more.
In addition, between different countries and even different provinces and states in Canada and the US - there is variations in standards of living. My provinces/states are more expensive than others (and again, even within a province or state, some areas are more expensive than others). A person living in New York, New York would need more $$$ than someone living in a small town in the east part of the state of New York). So, where one lives also needs to be considered in the calculation.
I mentioned my earnings in CDN. I probably pay more in taxes than my friends in the States - so my net income would be less (even if my friends in the states made the same amount after taking account the rate of exchange). On the other hand - I get free medical - so this might bump my standard of living higher than my friends in the states.
To better illustrate my income - it would be wiser to state income in terms of the average in our respective areas. I make a little above average for my province (mean average in my province is around mid $40,000 gross per year). If I worked full time, I would be making around $48,000 per annum. However, to further murky things - If I was working full time, I would also get some sweet benefits - including a dental plan, extended medical plan - including perscriptions, life insurance, long term disability insurance and 20 + paid vacation days per year. I am not sure if the provincial average takes into account benefits plans. If it does not - then I would make well over the provincial average.