Answer:
Frederick Jackson Turner argued that overseas expansion was a "safety valve" to keep ambitious Americans content.
The Harappan civilization is the last of the Neolithic Civilizations. They were the main founders of iron and helped create the iron age, which becomes important in the time that follows. They were located along the indus river and were considered one of the biggest accomplishments of the Indus Valley civilization.
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I think the answer is increase an increase in demand for the stocks of similar companies. If all similar stocks would increase, the effect would also increase the stock price of a company. This is could be in consideration of sudden changes of factors in the market that gave basis for price increases. This might have created a standard of near prices for similar stocks.