It's even more basic than a barter system, which is based on trade.

It was actually the oldest way in the world, a barter system.

Or perhaps they worked on some sort of barter system.

"No one had any money then so we used the barter system," she says.

Money continued to be scarce and much business was conducted by the barter system.

It was time, she suggested, for a return to the barter system.

The business people often use the local currency in one another's businesses, much like a barter system.

He again identified the barter system for the few things which they require and do not produce themselves.

Given the tumult of the past few years, the barter system is starting to look good.

So the black market flourishes, based on a barter system.