If you follow Fareed Zakaria, this is his place but the article is written by Venessa Miemis and entitled “4 trends shaping the emerging “superfluid” economy”
Here is a short preview and also the paragraph that includes LETS and Bitcoin!
4. Peer-to-peer exchange changes the future of money
All of these tools offering ways for people to connect, quantify, collaborate, and take action add up to new infrastructures for building trust and exchanging value at every level. You can explore Collaborative Consumption to see the hundreds of peer-to-peer marketplaces that are springing up around the world, or check out The Mesh Directory to see how businesses are leveraging social networks and resource sharing to up their efficiency.
As money and exchange increasingly go digital, our assumptions about what “currency” means are also being challenged. Facebook Credits, for example, are Facebook’s internal virtual currency used to purchase digital goods within their game ecosystem. There are already apps being developed to reward potential customers with discounts and free merchandise in exchange for playing social games and brands are rewarding users with Credits to perform certain actions on their behalf.
On the fringes of society exists the complementary currency market – a range of mechanisms that allow for peer-to-peer value exchange through mutual credit systems like LETS or via decentralized currencies like Bitcoin. When the tools are in place to allow individuals or groups within a local area to easily exchange value without using traditional/centralized currency, it’s reasonable to expect a serious challenge to the ingrained public perception of money.