Nicholas Theocarakis wrote: >Samuel Bostaph said: >> If you recall, Bob Hebert presented a very amusing paper at the SEA several >> years ago (and I think it was subsequently published) asking why dogs would >> trade one bone for another anyway. > >Recall also Edwin Cannan comment on WoN I.II: "It is by no means clear what >object there could be in exchanging one bone for for another." > >Nicholas Theocarakis People go to "swap meets" all the time. Not to mention "garage sales." As a Boy Scout, I would spend hours at conventions ("jamborees") swapping my "patches" for others. ("Patches" are sewn insignia.) I had several that were exactly alike, so naturally I was interested in swapping most of them for others all different. But in an even simpler situation, one tires of a music recording, or an article of clothing, and it is easy to imagine wanting to make a like-kind exchange for something equivalent but different. Or swapping a book that you've read for one that you haven't read. I can't speak to bones. Martin C. Tangora