Surprisingly, it isn’t the weirdest way that Simmons has been paid in the last year. Since leaving a full-time job at investment management firm Phillips, Hager & North in 2010 and embarking on a year-long experiment as a barter-only financial consultant, she’s been compensated with a tutorial in butter-churning, a large bag of toiletries, and a chance to perform with the University of Toronto cheerleaders. “I had a guy come up to me once and say, ‘I’m a fire-breather and I’d like to barter with you,’ ” Simmons says. “I was like, ‘I don’t think I can say no to that.’ ”
Adam Smith, the father of modern economics, sought to demonstrate that markets (and economies) pre-existed the state, and hence should be free of government regulation. He argued (against conventional wisdom) that money was not the creation of governments. Markets emerged, in his view, out of the division of labour, by which individuals began to specialize in specific crafts and hence had to depend on others for subsistence goods. These goods were first exchanged by barter. Specialization depended on trade, but was hindered by the "double coincidence of wants" which barter requires, i.e., for the exchange to occur, each participant must want what the other has. To complete this hypothetical history, craftsmen would stockpile one particular good, be it salt or metal, that they thought no one would refuse. This is the origin of money according to Smith. Money, as a universally desired medium of exchange, allows each half of the transaction to be separated.[2]
Bartering may sound like a style of commerce more fitting to a backwater marketplace than a modern capitalist environment. According to the International Reciprocal Trade Association—an organization created to promote “just and equitable standards” in modern bartering—the U.S. barter market is a staggering $12 billion annually. In other words, $12 billion worth of goods and services are traded every year without any currency changing hands. Scott Whitmer, founder of trade exchange company Florida Barter, says that while 2011 saw positive signs of an economic recovery, many small and medium-size companies are still struggling. “Bartering has continued to help many [of these] companies grow and conserve cash,” he says. Though Florida Barter enjoyed a record 2011—a 12 percent increase in total trade volume; more than $17 million worth of trades among the 1,600 clients—Whitmer says bartering as a business practice is still in its infancy, “on the cusp of exploding.”
Trade did occur in non-monetary societies, but not among fellow villagers. Instead, it was used almost exclusively with strangers, or even enemies, where it was often accompanied by complex rituals involving trade, dance, feasting, mock fighting, or sex—and sometimes all of them intertwined. Take the indigenous Gunwinggu people of Australia, as observed by the anthropologist Ronald Berndt in the 1940s:
But various anthropologists have pointed out that this barter economy has never been witnessed as researchers have traveled to undeveloped parts of the globe. “No example of a barter economy, pure and simple, has ever been described, let alone the emergence from it of money,” wrote the Cambridge anthropology professor Caroline Humphrey in a 1985 paper. “All available ethnography suggests that there never has been such a thing.”
Dave Evans, a Barter Business Unlimited member who operates an online ticket reseller in Plainville, Conn., called EasySeat, was first attracted to bartering as a means to sell distressed inventory. “Our inventory is 100 percent speculative,” he says. “Bartering is a way for us to liquidate inventory that we might not be able to sell for cash.” He’s bartered tickets to New York Yankees championship games and Lady Gaga concerts, and in exchange he’s received everything from a fresh paint job at a company building to an overhauled office alarm service. Sometimes, though, he’s bartered for services that weren’t exactly essential to his business. “I used some of the barter money to get Lasik surgery for myself,” he says. “I guess that’s a little counterintuitive.”
Economic historian Karl Polanyi has argued that where barter is widespread, and cash supplies limited, barter is aided by the use of credit, brokerage, and money as a unit of account (i.e. used to price items). All of these strategies are found in ancient economies including Ptolemaic Egypt. They are also the basis for more recent barter exchange systems.[15] 

In England, about 30 to 40 cooperative societies sent their surplus goods to an "exchange bazaar" for direct barter in London, which later adopted a similar labour note. The British Association for Promoting Cooperative Knowledge established an "equitable labour exchange" in 1830. This was expanded as the National Equitable Labour Exchange in 1832 on Grays Inn Road in London.[21] These efforts became the basis of the British cooperative movement of the 1840s. In 1848, the socialist and first self-designated anarchist Pierre-Joseph Proudhon postulated a system of time chits. In 1875, Karl Marx wrote of "Labor Certificates" (Arbeitszertifikaten) in his Critique of the Gotha Program of a "certificate from society that [the labourer] has furnished such and such an amount of labour", which can be used to draw "from the social stock of means of consumption as much as costs the same amount of labour."[22]
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.