At the straw market in Nassau, in the Bahamas, — famous for stuff like the straw handbags below — I recently encountered a distinctive culture of bargaining that made me stop and ponder the subject (on a beach, aided by rum). The pondering resulted in a neat little flash of insight that allowed me to synthesize everything I know about the subject in a way that surprised me. The short version: game-theoretic and information-theoretic approaches to the subject are something between irreleva...