If I wanted to get a better salary, my boss and I would have to bargain to figure out what is fair. A big example with this is in factories with working conditions. For example, wanting a certain amount of break time, or having drinks included with their work, etc. I don't know what they examples are, but this definition should help you out. If it doesn't, just comment what the examples are and I'll help figure out which one it is.
They mostly grew wheat, barley, oats, rye, and corn. because of this, they were basically known as the "Breadbasket". So I believe your answer would most likely be wheat.
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2, it's the best option out of all of them. If I had a choice though I would say 8 is the best.
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Men become enemies because they both desire the same thing which cannot be shared. Men would compete for it and become enemies.
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One reason : Machines were too difficult for workers to use.