The United States is trading salmon to Peru in exchange for anchovies. If these nations are trading based upon relative per-unit opportunity costs, what must be the case?
A The United States has comparative advantage in salmon production, and Peru has absolute advantage in anchovy production.
B The United States has comparative advantage in salmon production, and Peru has comparative advantage in anchovy production.
The United States has absolute advantage in anchovy production, and Peru has absolute advantage in salmon production.
The United States has comparative advantage in anchovy production, and Peru has comparative advantage in salmon production.
The United States has absolute advantage in salmon production, and Peru has absolute advantage in anchovy production.

B The United States has comparative advantage in salmon production, and Peru has comparative advantage in anchovy production.

Explanation:

For the exchange to be based upon relative per-unit opportunity costs, there is need for one of the countries to be at a comparative advantage in one of the products.

This offer them the opportunity to be at the deciding factor on which countries they would like to trade with. From the scenario, it shows that United States and Peru both have comparative advantage with the different products which they are trading with each other.

c. wright mills's sociological imagination suggest investigating to explain this increase?

uses : -

1.aneroid barometers primarily measure whether pressure is rising or falling.

2.aneroid barometers are often used for reading pressure in homes and recreational boats.  

3.other uses may include barographs in meteorology and altimeters in modern aircraft.  

4.this type of barometer can announce whether a high or low pressure system is coming or whether it is becoming more intense.  

5.there are different types of aneroid barometers, such as the altimeter, which measures altitude, or distance above sea level.  

6.another example is a barograph, which is a modified aneroid barometer that provides constant readings of atmospheric pressure on graph paper.  

7.when used in this capacity, the aneroid barometer can store a week's worth of data.

android diameter a device for measuring atmospheric pressure , often specially calibrated for use as an altimeter ,consisting of a box or chamber partially exhaused of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air

refer to the attachment for the characteristics : -