<p>Basically all the 3 degrees have similar lower division requirements (all the basic macro and micro econ). However, as you get into the upper division classes, management science has more of a focus on microeconomics and the quantitative aspects of decision making (more micro focused), while econ will be more focused on the policies and effects political decisions have on the economy (so more macro focused). If you check the econ department website at <a href=“http://econ.ucsd.edu%5B/url%5D”>http://econ.ucsd.edu</a>, they have all the program requirements and explain the difference between the 3 majors. To sum it up econ = least math, econ/math = most math/programming, management science is somewhere in between the 2. If you plan on going into a field like investments or finance I would recommend doing the management science path because it meets most of the requirements for masters programs in financial engineering and is more technical. If you genuinely want to be an economist then go for econ. I personally think that joint math/econ isn’t as useful of a major as the other 2 and don’t really have an idea of where you could go with it. I’m sure you could also work in securities and financial engineering with this degree, but I personally think it replaces too much of the upper division economics classes with nonsense math classes which you probably won’t use in the future.</p>