Other anthropologists have questioned whether barter is typically between "total" strangers, a form of barter known as "silent trade". Silent trade, also called silent barter, dumb barter ("dumb" here used in its old meaning of "mute"), or depot trade, is a method by which traders who cannot speak each other's language can trade without talking. However, Benjamin Orlove has shown that while barter occurs through "silent trade" (between strangers), it also occurs in commercial markets as well. "Because barter is a difficult way of conducting trade, it will occur only where there are strong institutional constraints on the use of money or where the barter symbolically denotes a special social relationship and is used in well-defined conditions. To sum up, multipurpose money in markets is like lubrication for machines - necessary for the most efficient function, but not necessary for the existence of the market itself."[13]
Since the latest series of worldwide economic meltdowns, people have bartered in growing numbers. Last year, the 100 members of the International Reciprocal Trade Association, a network of barter and trade exchanges, facilitated the bartering of billions of dollars’ worth of goods and services around the world. (The IRTA uses its own barter currency called Universal Currency.) In some areas of Greece, bartering has become as second nature as paying for things with cash—there’s even a new barter-style currency called the TEM, accrued through offering goods and services via a vast online network and regular open-air market days. Spain’s time bank system, in which people exchange hours of labour instead of units of currency, has grown exponentially as a result of the country’s crippled economy.
Simmons learned how to ask after one Barter Babe, a veteran barterer, told her she needed to post a wish list. Following the advice, she eventually got not just one bike but two (one for her and one for Matt), a TTC pass, yoga lessons, a haircut and food she wanted to eat, among hundreds of other things. Simmons made exceptions for some unique trades, too, such as both circus performance training and butter churning lessons, the latter of which she now barters as a skill to others. She even worked up the nerve to approach local businesses in person, armed with a business case for barter. One café near her apartment traded a month’s worth of morning coffee for a financial session; a boutique hotel, Hotel Ocho at Queen and Spadina, took a financial seminar luncheon for its employees in return for an overnight stay for Simmons’s parents, who were celebrating their 35th anniversary.
Within the week, Simmons gave notice to her employer. By then, she’d been pining to leave for eight months and had diligently saved for the occasion. Her plan now was to barter her financial services with other women for one year. That would be enough time, she figured, to get the altruism out of her system, but not so much that she’d go broke. She would use $10,000 in savings to pay her cellphone bill and to parcel out $35 in emergency spending each week if and when bartering fell through on the basic necessities. That money would also help pay for most of the rent at the Dovercourt and Queen apartment she shared with her boyfriend, Matt, who was in the midst of changing careers. Everything else—food, clothing, haircuts, fitness, entertainment and transportation around the city—she would acquire through barter. Simmons figured she’d need to barter with 300 women to make it work. She gave the project a catchy name, Barter Babes, and started organizing a launch party.
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).[14]

Although, as a general case, a ship unlucky in falling in with whales continues to cruise after them until she has barely sufficient provisions remaining to take her home, turning round then quietly and making the best of her way to her friends, yet there are instances when even this natural obstacle to the further prosecution of the voyage is overcome by headstrong captains, who, bartering the fruits of their hard-earned toils for a new supply of provisions in some of the ports of Chili or Peru, begin the voyage afresh with unabated zeal and perseverance.