Since the 1830s, direct barter in western market economies has been aided by exchanges which frequently utilize alternative currencies based on the labor theory of value, and designed to prevent profit taking by intermediators. Examples include the Owenite socialists, the Cincinnati Time store, and more recently Ithaca HOURS (Time banking) and the LETS system.
Zipcar has been renting cars by the hour or day for years now, and they keep adding to their list of participating cities. You can pay different membership and rental rates, depending on how frequently you think you’ll need a Zipcar. Though the process varies, you basically sign up in your city, pay the application fee of $25 and any annual fees (ranging from $0 to $60, depending on the plan), and voila – you can now borrow a Zipcar for an hourly rate or daily charge. The rental includes gasoline, auto insurance, and 180 free miles, which is usually plenty.

BizXchange is for business-to-business barter, where members use “BizX dollars” to help each other save cash on expenses and find new ways to grow their businesses. BizX dollars are earned by (and can be spent on) selling products, services, or unused inventory to other members. Membership costs include a one-time initiation fee of $795, a $15 cash/$15 BizX monthly fee, and a 6% fee on each transaction with other members.
Modern barter and trade has evolved considerably to become an effective method of increasing sales, conserving cash, moving inventory, and making use of excess production capacity for businesses around the world. Businesses in a barter earn trade credits (instead of cash) that are deposited into their account. They then have the ability to purchase goods and services from other members utilizing their trade credits – they are not obligated to purchase from those whom they sold to, and vice versa. The exchange plays an important role because they provide the record-keeping, brokering expertise and monthly statements to each member. Commercial exchanges make money by charging a commission on each transaction either all on the buy side, all on the sell side, or a combination of both. Transaction fees typically run between 8 and 15%. 
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