That is where the "weirdly inefficient from the borrower's side" part comes in. It's a form of price discrimination. People who can't afford to pay full price,

That is where the "weirdly inefficient from the borrower's side" part comes in. It's a form of price discrimination. People who can't afford to pay full price, pay by their inconvenience instead. I think we found a good equilibrium--library buys a copy and only lends it out one at a time. We know that works. Why change it.