exchange and barter造句

And this marketplace for the anonymous exchange and barter of murderous information also sells fantasies of death and suicide.
The introduction of up-to-date business methods, strongly contrasted with the primitive systems of exchange and barter and it became necessary to be properly equipped in order to meet the competition from other quarters.
Reflecting that academic background, he was said to have come upon his interest in international banking in a less-than-usual way : While living for 14 months with the Wachagga tribe in Tanzania, he became intrigued by how people who were normally separated by great distances managed to exchange and barter goods when they came together.
It's difficult to find exchange and barter in a sentence. 用exchange and barter造句挺难的