Answer:
transportation
Explanation
without trains, cars or even good old horseback we would not be able to disperse trade goods or necessities such as food and medical supplies to others
If I'm not wrong it's electric because without electricity many advancements wouldn't have been possible like for example; trains, light, radio etc; hoped it helped!
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.
