Another potential benefit is more encouragement to read the book in a timely manner. When I've been given books in the past I often take a long time to read them, because I know I'll always be able to and it rarely seems urgent. When lent a book, even with no specific timeframe to return it, I feel pressure to either start reading it soon, or acknowledge I'm not going to and return it so someone else can read it.
EA books give a much more thorough description of what EA is about than a short conversation, and I think it's great that EA events (ex: the dinners we host here in Boston) often have ones like Doing Good Better, The Precipice, or 80,000 Hours available. Since few people read quickly enough that they'll sit down and make it through a book during the event, or want to spend their time at the event reading in a corner, the books make sense if people leave with them. This gives organizers ~3 options: sell, lend, or give.
Very few people will be up for buying a book in a situation like this, so most EA groups end up with either lending or giving. I have the impression that giving is more common, but I think lending is generally a lot better:
A loan suggests that when you're done reading the book you've considered the ideas and don't need the book anymore. Giving suggests it's more like doctrine you keep and reference.
You don't get back all the books you lend, and that's ok, but in my experience we do get most of them back. Lending out the same book over and over is a lot cheaper than buying a new book each time. Giving books is (and looks) unnecessarily lavish.
Returning the book offers a chance to talk about reactions.
Lending out books doesn't mean you need to run it like a library, with records and late fees. We've put the books out with stickies saying "borrow this book", they go out, and they mostly come back again.
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