Answer:
When two people trade they are giving eachother that seems like a deal to each side. Since ancient times people have also trader so where they both feel like they had a good deal.
I dont know because there is no other background knowledge but they should probably use a lie detector
In the soviet union what was the opportunity cost of the emphasis on heavy industry was the makers of consumers goods and services paid the opportunity cost of this concentration of resources. <span> leftovers, lower quality resources, so they could not use the scrapes to make anything else out of it, or by recycling.</span>