Why a lecture resists automation
A factory can often make more goods per worker by reorganizing production or adding machines. A lecture has a stubborn limit: students still need time to hear an explanation, ask questions, and get feedback. A professor may use better tools, but those tools do not necessarily let one instructor teach twice as much while preserving the same kind of close attention.
Economists call the resulting pressure cost disease. It does not mean universities are becoming less efficient; it describes what happens when wages rise across an economy but productivity improves much faster in some jobs than in others.
The wage link across the economy
Pay cannot stay fixed in a low-productivity field simply because its work is hard to speed up. Universities compete with employers that can offer faculty other career options, and they also need staff in fields whose pay is influenced by the broader labor market. If those salaries rise, a university generally has to raise its own offers to recruit and retain people.
So the cost of providing a lecture rises even when the lecture itself has not become longer. Meanwhile, industries that produce more per worker can spread higher wages across more output, helping keep the cost of each product in check. Education has fewer such gains to offset pay increases.
What the pressure changes
Universities can respond by increasing tuition or seeking more funding, but they may also change the mix of what they provide: larger introductory classes, more teaching assistants, or greater reliance on recorded material. Those choices can stretch limited resources, though they do not all replace the same human contact.
The underlying tradeoff is concrete: when an hour of skilled attention remains an hour, keeping that attention available becomes more expensive relative to goods that workers can produce faster each year.
