Barter-based economies are one of the earliest, predating monetary systems and even recorded history. People can successfully use barter in many almost any field. Informally, people often participate in barter and other reciprocal systems without really ever thinking about it as such -- for example, providing web design or tech support for a farmer or baker and receiving vegetables or baked goods in return. Strictly Internet-based exchanges are common as well, for example exchanging content creation for research.
Inevitably some people may feel like they were taken advantage of. One way to diminish inequities is to engage in dollar-for-dollar trades. For example, if you would like to trade your housecleaning service for someone’s couch, try to break down the goods and services to the dollar amount. If the two of you decide that the value of the couch is worth $200, why don’t you supply a gift certificate for $200 worth of housecleaning services? It’s a wise course and ensures all parties know what they are getting and what they are offering. 

Finding a way to make a profit from bartering isn’t just a challenge to the people putting up their livelihood for trade. Even the brokers who act as bartering middlemen are searching for creative ways to make money from a service that isn’t about making money. A website like Swap.com—which connects people who want to exchange their unused household items—looks, at least on paper, like a financial windfall. Jeff Bennett, Swap.com’s CEO, claims that “the business has been doubling every year.” They’re closing in on 450,000 registered users, who’ve taken part in more than 4 million barter exchanges valued at approximately $13 million since the site’s inception in 2010. But as no part of that $13 million is in actual money, how exactly does Swap.com cover its overhead? Most of its capital comes from “related aspects of the business,” says Bennett, such as shipping fees and corporate sponsorships. “We’ve had very good experiences with companies like Gallo wines, LuLu’s Clothing, and ModCloth.” He also hopes to introduce a Swap.com subscription service in the near future that offers customers incentives for forking over a monthly fee, like an ad-free environment and early access to their favorite items.

It is estimated that over 450,000 businesses in the United States were involved in barter exchange activities in 2010. There are approximately 400 commercial and corporate barter companies serving all parts of the world. There are many opportunities for entrepreneurs to start a barter exchange. Several major cities in the U.S. and Canada do not currently have a local barter exchange. There are two industry groups in the United States, the National Association of Trade Exchanges (NATE) and the International Reciprocal Trade Association (IRTA). Both offer training and promote high ethical standards among their members. Moreover, each has created its own currency through which its member barter companies can trade. NATE's currency is the known as the BANC and IRTA's currency is called Universal Currency (UC).[28]
It’s hard to answer that without actually seeing a modern gift economy in action. Luckily, modern gift economies actually do exist. On a small scale, they exist among friends, who might lend each other a vacuum or a cup of flour. There’s even an example of a gift economy on a much larger scale, albeit one that’s not always in operation: The Rainbow Gathering, an annual festival in which about 10,000 people gather for a month in the woods (it rotates among various national forests around the country each year) and agree not to bring any money. Groups of attendees set up “kitchens,” in which they prepare and serve food for thousands of people every day, all for free. Classical economists might guess that people would take advantage of such a system, but, sure enough, everyone is fed, and the people who don’t cook play music, set up trails, teach classes, gather firewood, and perform in plays, among other things.
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