The principal concept behind comparative advantage is that a nation should (points : 4) maximize its volume of trade with other nations. use tariffs and quotas to protect the production of vital products for the nation. concentrate production on those products for which it has the lowest domestic opportunity cost. strive to be self-sufficient in the production of essential goods and services.

Consider these text features from chapter 1 of wheels of change by sue macy. as the demand for bicycles grew in the 1890s, so did the demand for accessories—such as bells, locks, and lamps—and repairs. this photograph shows the joseph h. ferodowill bicycle repair shop in st. paul, minnesota, in 1899. this photo and caption enhance the book’s information about .

Why is reasoning relivant to reading and evaluate text?

Read the passage. the dust bowl during the 1930s, extreme drought and high winds made life incredibly difficult in the great plains region of the united states. in many areas, rainfall was forty percent less than normal. the soil became extremely dry, and when strong winds blew, they created tremendous dust storms. these so-called “black blizzards” were so thick that they made daylight seem like dusk. during this terrible period, the great plains region of the united states was named the “dust bowl.” over the next few years, the drought continued, and the winds created more dust storms. in some places, the drought and high winds lasted for eight years. many people wondered if the black blizzards would ever end. which statement about this paragraph’s main idea is true? this paragraph’s main idea is stated in the topic sentence. there are not enough details to support the main idea. this paragraph’s main idea is implied. this paragraph does not express a main idea.