For the past few years I have charted the trends in American education spending and performance (see below). The goal is to see what the national data suggest about the productivity of our education system over time. Clearly, these data suggest that our educational productivity has collapsed: the inflation-adjusted cost of sending a student all the way through the K-12 system has almost tripled while test scores near the end of high-school remain largely unchanged. Put another way, per-pupil spending and achievement are not obviously correlated.