Two very different takes on the business of selling books (both of which I have used and appreciated).
I have bought quite a number of books for one penny (plus £2.95 p&p) in good or very good condition and have often wondered how anyone makes any profit from them. Read the full story here in the New York Times magazine. It doesn't explain though the anomalies of new copies often being cheaper than used copies. Why would anyone buy Norman Ackroyd's lovely Shetland Sketchbook for £90.19 used, when you could buy a new copy for £16.95? (Not signed or 'collectible'.)
Another efficiently run operation is Barter Books in Alnwick in the north of England. but they do it with tea and cakes and a certain amount of whimsy!. Be charmed by their lovely video here. Must plan another visit....
I have linked to this before but you may like to see again the video of the Keep Calm and Carry On poster, which I have to admit, brings a lump to my throat.
I think the book business is still pretty much alive.