As the cost of production goes down, the diversity of what is viable to publish goes up super-linearly.

Before the printing press only the very most important books are ever copied.

The only books that cleared that threshold were the Bible, and every so often a few classics from antiquities.

Nothing else cleared that floor.

The printing press lowered the Coasian floor by making it orders of magnitude cheaper to produce books.

A linear decrease in friction makes more of the power law above the viability waterline.