Okay, so if we double our funding, CATO thinks the scores in the SAT math test should go from 800 to 1600?
This looks to my untrained eye like total bullshit. The X axis indicates that "the" cost in 2012 was ~ 190% - OF WHAT? Is that per student, for ALL students, or what? Meanwhile all the test scores hover around zero. So, the graph seems to indicate that by 2012 we were paying 190% of ... something???? ... to enable students to learn ZERO reading, math or science.
I think one of the products of just such a system must have put that together.
It's not that bad--those are changes from baseline. The problems with that graph are students have been going up and special ed is a bigger portion of the budget.