Trust or a monopoly position. And in this context trust doesn't scale, you need good teachers for every [class size] students. That means profit only scales li

Trust or a monopoly position. And in this context trust doesn't scale, you need good teachers for every [class size] students. That means profit only scales linearly with good teachers (the scarce resource). Marketing scales though, and what matters to the consumer is how much they believe the actual value is compared to the competition for what they believe their options are.