Re: Elections 2012 -- Kull Wahad!!!
I think the main point is that as much as politicians try to use teachers as a political tool when one side calls for budget cuts saying how many teachers will get fired it wouldn't actually have a negative affect on the students. It certainly points out that there is waste in the system that can be cut even if it doesn't point out exactly where.
Exactly. The author wasn't trying to "prove" any sort of causality. He's not arguing that the 100% increase in teachers caused an 8.5% increase in students (or vice versa). He's just reporting (possible -sources would be nice!) facts. It's not even a correlation - just two pieces of data showing changes in two independent parameters over the last 40 years.
I think the main point is that as much as politicians try to use teachers as a political tool when one side calls for budget cuts saying how many teachers will get fired it wouldn't actually have a negative affect on the students. It certainly points out that there is waste in the system that can be cut even if it doesn't point out exactly where.