Anthropologists have argued, in contrast, "that when something resembling barter does occur in stateless societies it is almost always between strangers, people who would otherwise be enemies." Barter occurred between strangers, not fellow villagers, and hence cannot be used to naturalisticly explain the origin of money without the state. Since most people engaged in trade knew each other, exchange was fostered through the extension of credit. Marcel Mauss, author of 'The Gift', argued that the first economic contracts were to not act in one's economic self-interest, and that before money, exchange was fostered through the processes of reciprocity and redistribution, not barter. Everyday exchange relations in such societies are characterized by generalized reciprocity, or a non-calculative familial "communism" where each takes according to their needs, and gives as they have.
As Orlove noted, barter may occur in commercial economies, usually during periods of monetary crisis. During such a crisis, currency may be in short supply, or highly devalued through hyperinflation. In such cases, money ceases to be the universal medium of exchange or standard of value. Money may be in such short supply that it becomes an item of barter itself rather than the means of exchange. Barter may also occur when people cannot afford to keep money (as when hyperinflation quickly devalues it).
For example, the market for national security payloads and NASA missions (James Webb is a notable exception, bartered between NASA and ESA) are typically closed to Arianespace. — Eric Berger, Ars Technica, "As the SpaceX steamroller surges, European rocket industry vows to resist," 20 July 2018 Friends told the British press that Rowley would often search dumpsters for items to barter or sell. — William Booth, Anchorage Daily News, "Woman exposed to nerve agent in southern England dies; police launch murder investigation," 9 July 2018 Anyone who unlawfully captures or kills a big game animal and then sells or barters the animal is guilty of a felony. — Dustin Gardiner, azcentral, "10 Arizona laws that actually exist: Private armies, food-wasting ban, windshield repairs," 27 June 2018 This early depiction suggests that although chocolate was being bartered at this point, it may not have been traded as a form of currency, Baron says. — Joshua Rapp Learn, Science | AAAS, "The Maya civilization used chocolate as money," 27 June 2018 To generate publicity, the cash is handed out at ceremonies held in the weekly roadside markets where villagers gather to barter meager fish hauls for goods like plastic buckets or quart bottles of gasoline. — New York Times, "Nearly Eradicated in Humans, the Guinea Worm Finds New Victims: Dogs," 18 June 2018 Prize is not transferable or redeemable for cash and may not be sold, bartered or auctioned. — Union-tribune Rewards, sandiegouniontribune.com, "Enter to Win Two Tickets to San Diego Legion's Inaugural Rugby Season as well as a gift certificate to Hundred Proof!," 11 May 2018 Others report punishment for having hoarded, rationed or bartered for menstrual products. — refinery29.com, "Meghan Markle Has Championed Menstrual Equity — Here's Why You Should Too," 21 May 2018 As the city bartered for water with local farmers and hustled to build desalination plants, its residents simply started using less water. — Ryan Lenora Brown, The Christian Science Monitor, "Squeezing more out of taps: How Cape Town cut consumption in half," 30 Apr. 2018
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.