A bachelor's degree is usually a four-year college degree, although some students may complete it in less or more time depending on their course of study. It may also be known as a B.A. (Bachelor of Arts) or B.S. (Bachelor of Science). It is the point of entry into many fields, as well as a requirement for obtaining a higher degree such as a master's degree, a law degree, or a degree in medicine. Career options are limited only by a student's interests and desire to pursue further education, since bachelor's degrees may be obtained in any area from archaeology to zoology. Those with bachelor's degrees can expect to earn (on average) nearly double what those with only high school degrees earn: an mean of $66,445 vs. $37,303, according to 2004 U.S. Department of Commerce data.