The correct answer is atomic bombs.
The equilibrium is the price that comes out from adding all the direct related costs in producing the good or service. To this total you have to add the indirect costs, for example, taxes, salaries, etc. Add up both results and you will have the price.
The equilibrium price is the price that covers all your expenses, both direct and indirect. With this price you do not lose nor earn any money.
B. The fire happened in 1871
From about 1811-1840 the Oregon Trail<span> was laid down by traders and fur trappers. It could only be traveled by horseback or on foot. By the year 1836, the first of the migrant train of wagons was put together. It started in Independence, Missouri and traveled a cleared </span>trail<span> that reached to Fort Hall, Idaho.</span>
