Assuming you aren’t talking about consumable items, then the library would get more from manufacturing them. A library economy doesn’t mean we stop all production, we just produce what’s needed and distribute them to libraries. This has major advantages, like essentially eliminating waste from overproduction, permanently ending planned obsolescence and the incentive to create more durable items, fosters community cohesion, and a lot more. Here’s a more thorough introduction to the topic through the lens of political anarchism, though it could exist in any leftist economy