An article in this week's Tacoma News Tribune points out that in the state of Washington, high school math and science teachers get paid less, on average, than teachers of other disciplines. The assumption–not backed up by research or widespread observation–is that math and science teachers are lured away to more lucrative careers in the high tech industry and therefore do not stay in teaching as long.
Besides that, this study by Jim Simpkins, Marguerite Roza, and Cristina Sepe and produced by the University of Washington's Center for Reinventing Public Education raises several valid points about teacher compensation. However, it is what the study does not include that concerns me most.