The market price for your phone book

Raphaël Labbé [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 4.0–3.0–2.5–2.0–1.0 (https://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons

Pre-internet days, I found a safely guarded phonebook in the house. It also backed up as an address book. It was usually near the phone. I did not know its value. I had a good idea what my TV would be worth if I had to sell it. Now we have data points on what the address book is worth for leasing/sharing with the outside world.