yes is great until there isn't something of value that you both have to exchange , or you don't know how to price it, which is how a medium of exchange first came about in the market place :) whether it's paper money like we have today (corrupt fraudulent central bank backed scheme) or cinnamon, precious metals, or even ramen noodles.. a number of things can be used as currency/medium of exchange to facilitate the bartering system and make that market more efficient for the people :) with the economic troubles in greece recently people were prevented from taking money out of their bank accounts and they too resorted back to an old bartering system and they also quickly created their own currency! lol : ) http://popupcity.net/community-currencies-and-bartering-models-take-root-in-greek-cities/