The whole point of barter is to satisfy a need. A valuable barter is whatever a barterer needs at that moment. Raj Dhiman, a 30-year-old chemist, joined Swapsity at the beginning of 2012. For his first barter, he traded a batch of home-baked gluten-free muffins in return for a full weekend first aid course. Unlike the course’s instructor, Dhiman relished the challenge of perfecting the recipe. Since then, he’s exchanged a lesson on how to create a website for an Indian cooking class. He’s also turned away barter offers that he didn’t find personal value in. “It’s perfectly fine to decline,” he says, “It wasn’t like, ‘Whoa, whoa, whoa. What is this person thinking?’ I’d say, ‘I appreciate the offer, but that’s not what I need right now.’ All you have to do is ask for what you need.”
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On paper, this sounds a bit like delayed barter, but it bears some significant differences. For one thing, it’s much more efficient than Smith’s idea of a barter system, since it doesn’t depend on each person simultaneously having what the other wants. It’s also not tit for tat: No one ever assigns a specific value to the meat or cake or house-building labor, meaning debts can’t be transferred.
Michael Linton originated the term "local exchange trading system" (LETS) in 1983 and for a time ran the Comox Valley LETSystems in Courtenay, British Columbia. LETS networks use interest-free local credit so direct swaps do not need to be made. For instance, a member may earn credit by doing childcare for one person and spend it later on carpentry with another person in the same network. In LETS, unlike other local currencies, no scrip is issued, but rather transactions are recorded in a central location open to all members. As credit is issued by the network members, for the benefit of the members themselves, LETS are considered mutual credit systems.
In his analysis of barter between coastal and inland villages in the Trobriand Islands, Keith Hart highlighted the difference between highly ceremonial gift exchange between community leaders, and the barter that occurs between individual households. The haggling that takes place between strangers is possible because of the larger temporary political order established by the gift exchanges of leaders. From this he concludes that barter is "an atomized interaction predicated upon the presence of society" (i.e. that social order established by gift exchange), and not typical between complete strangers.