This is a good defense of a true purpose of education - no doubt. However, I'd say that if we measured and ranked schools' impacts the number one would be in wo

This is a good defense of a true purpose of education - no doubt. However, I'd say that if we measured and ranked schools' impacts the number one would be in worker productivity: i.e. better jobs / wages + more positioned filled. The protection from aristocracy is part of it, but I'd bet it's not the biggest part.