Why Things Cost $19.95 Posted on 30 Apr 08 by FmH “What are the psychological ‘rules’ of bartering?” (Scientific American) Share Click to print (Opens in new window) Print Click to email a link to a friend (Opens in new window) Email MorePocket Click to share on WhatsApp (Opens in new window) WhatsApp Click to share on Telegram (Opens in new window) Telegram Tweet Click to share on Reddit (Opens in new window) Reddit Like Loading... Related