Six thousand years later--
Everyone was confused about how Hearts & Halos Bookshop stayed in business.
It had been on its particular London street corner as far back as anyone could remember. (The sign said Est. 1032, but presumably that was someone's idea of a joke.) So presumably it was making a profit.
But it was very unclear how.
Hearts & Halos Bookshop had, in a certain sense, plenty of customers. There were comfy armchairs to curl up in, and long tables for debating philosophy, and lots of little nooks for studying. The tea was always hot and the homemade cookies were heavenly. The female owner always knew how to recommend a book that uplifted you or said something about whatever you were struggling with or gave the perfect piece of advice. The male owner could explain whatever homework problem you were stuck on so that you understood it, could suggest the perfect source for your essay, and gossiped about historical economists as if he had personally known them. While the opening hours were erratic, it was always open when you really needed it.
But the tea was free and the cookies were free. While the books technically had prices, you could get them for free for reasons such as "you don't have any money", "you really need it", "books are supposed to be read", "it belongs in a good home", "you would really enjoy it", and "I forgot where the cash register was."
The students of London often speculated about the true nature of the owners. Perhaps they were mobsters laundering money, but it was hard to imagine the female owner doing any crime worse than jaywalking, and while the male owner did technically wear sunglasses inside he also bounced excitedly about NBER papers. Perhaps they were eccentric billionaires, although none of the wealthier students had any idea who their families were. Perhaps they were spies and it was their cover story.