Some economists, such as Cornell's Robert Frank, have pushed the argument that higher tax rates are good because they discourage people from working too hard. This argument makes sense if a person's hard work and resulting high consumption conveys a negative externality on his neighbors.
I am a professor and chairman of the economics department at Harvard University, where I teach introductory economics (ec 10). I use this blog to keep in touch with my current and former students. Teachers and students at other schools, as well as others interested in economic issues, are welcome to use this resource.