"How could it be otherwise when there is now a six-order-of-magnitude gap between the cost of watching a Khan Academy video ($0) and the cost of dozing through

"How could it be otherwise when there is now a six-order-of-magnitude gap between the cost of watching a Khan Academy video ($0) and the cost of dozing through the same content in a Harvard lecture hall ($250,000)?" Oh come on, surely you know pre-calculus better than that.