By 2016, most guiding services cost between US$35,000–200,000. Going with a "celebrity guide", usually a well-known mountaineer typically with decades of climbing experience and perhaps several Everest summits, can cost over £100,000 as of 2015. However, the services offered vary widely and it is "buyer beware" when doing deals in Nepal, one of the poorest and least developed countries in the world. Tourism is about four percent of Nepal's economy, but Everest is special in that an Everest porter can make nearly double the nation's average wage in a region in which other sources of income are lacking.