I am an American and have lived and worked in Ethiopia for many years. I've lived in Addis, Harar, Gondar and other cities. I know the country well. I am currently on break for a year residing in the United States. I plan to return to Ethiopia in the next few months. To answer your question about whether you can live in Addis on US$4,000. Answer? A resounding yes depending upon lifestyle.You can live a very comfortable life as a forenji (foreigner) for much, much less. However, if you live an extravagant lifestyle- eating out all the time in nice restaurants, drinking alcoholic beverages at the night clubs, and traveling for fun around the country- you will need the US$4000/month. If you have children, you will want to put them in a private school. These schools can are expensive, but they are worth it as they have well-paid forenjis who speak English as a native language and many of them are licensed to teach in their countries back home. Other areas where Addis is a financial challenge are: a. decent housing in a nice neighborhood (A nice house in a private compound with a guard and maid.), b. automobile costs if you wish to buy a car, and c. internet/communications costs. I suggest that you ask a national co-worker to assist you in finding housing after you arrive. Stay at as hotel for a while as you get settled in the city. I recommend the Bashale Hotel in CMC or you can get expensive and stay at the Addis Hilton or Sheraton Hotel. There are Americans who can live nicely on US$800 a month, but without all the luxuries. Also, get your green card as soon as possible. Don't rush into anything. Take your time as you make big decisions. Addis is a wonderful city.