41. Many of them haven't been paid in months, having to use a barter system to acquire the bare essentials. 42. It is also different from a barter system , where property rights are central to the idea behind barter and exchange. 43. Some of the most advanced networks take place with virtual economies that may use a barter system or currency system. 44. Instead, each barter system uses its own in-house currency, a kind of Monopoly money that works only within that system. 45. It is likely that early hominid forms used a barter system : two of your reindeer hides for my axe. 46. Those who joined the exchange agreed to carry out transactions without the use of money, a barter system using exchange notes. 47. Aja, former vice president of the Arizona Wool Producers, said many of the Basques in Arizona worked on a barter system . 48. A new economic system based on monetary exchange replaced the barter system allowing people the freedom to move about the empire. 49. The company expects to reach sales value among members using the barter system of Bt8 billion over the next five years. 50. Sticking to the informal style that was characteristic of the Net's early days, they have tended to use a rough-and-ready barter system .
