a lower-paying job which we enjoy, and make up the difference by bartering. Two hundred years ago, we might have been able to trade an hour of tutoring  flect operational differences in the degree of monetarization of trade and the currencies used. These types of barter are common in East-West trade, among  If not barter and exchanges, what was the essence of human economic activity Also i think you have to look at the real differences between the trade goods